256 lines
9.7 KiB
PHP
256 lines
9.7 KiB
PHP
<?php
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declare(strict_types = 1);
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// {{{ License
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// This file is part of GNU social - https://www.gnu.org/software/social
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//
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// GNU social is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// GNU social is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
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// }}}
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namespace App\Util;
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use App\Core\DB\DB;
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use App\Util\Exception\BugFoundException;
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use App\Util\Exception\DuplicateFoundException;
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use App\Util\Exception\NicknameEmptyException;
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use App\Util\Exception\NicknameException;
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use App\Util\Exception\NicknameInvalidException;
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use App\Util\Exception\NicknameNotAllowedException;
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use App\Util\Exception\NicknameTakenException;
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use App\Util\Exception\NicknameTooLongException;
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use App\Util\Exception\NotFoundException;
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use App\Util\Exception\NotImplementedException;
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use Functional as F;
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use InvalidArgumentException;
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/**
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* Nickname validation
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*
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* @category Validation
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* @package GNUsocial
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*
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* @author Zach Copley <zach@status.net>
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* @copyright 2010 StatusNet Inc.
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* @author Brion Vibber <brion@pobox.com>
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* @author Mikael Nordfeldth <mmn@hethane.se>
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* @author Nym Coy <nymcoy@gmail.com>
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* @copyright 2009-2014 Free Software Foundation, Inc http://www.fsf.org
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* @author Daniel Supernault <danielsupernault@gmail.com>
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* @author Diogo Cordeiro <mail@diogo.site>
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* @author Hugo Sales <hugo@hsal.es>
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* @copyright 2018-2021 Free Software Foundation, Inc http://www.fsf.org
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* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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*/
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class Nickname
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{
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/**
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* Maximum number of characters in a canonical-form nickname. Changes must validate regexs
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*/
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public const MAX_LEN = 64;
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/**
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* Regex fragment for pulling a formated nickname *OR* ID number.
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* Suitable for router def of 'id' parameters on API actions.
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*
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* Not guaranteed to be valid after normalization; run the string through
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* Nickname::normalize() to get the canonical form, or Nickname::isValid()
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* if you just need to check if it's properly formatted.
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*
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* This, DISPLAY_FMT, and CANONICAL_FMT should not be enclosed in []s.
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*/
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public const INPUT_FMT = '(?:[0-9]+|[0-9a-zA-Z_]{1,' . self::MAX_LEN . '})';
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/**
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* Regex fragment for acceptable user-formatted variant of a nickname.
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*
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* This includes some chars such as underscore which will be removed
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* from the normalized canonical form, but still must fit within
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* field length limits.
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*
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* Not guaranteed to be valid after normalization; run the string through
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* Nickname::normalize() to get the canonical form, or Nickname::isValid()
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* if you just need to check if it's properly formatted.
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*
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* This, INPUT_FMT and CANONICAL_FMT should not be enclosed in []s.
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*/
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public const DISPLAY_FMT = '[0-9a-zA-Z_]{1,' . self::MAX_LEN . '}';
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/**
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* Simplified regex fragment for acceptable full WebFinger ID of a user
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*
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* We could probably use an email regex here, but mainly we are interested
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* in matching it in our URLs, like https://social.example/user@example.com
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*/
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public const WEBFINGER_FMT = '(?:\w+[\w\-\_\.]*)?\w+\@' . URL_REGEX_DOMAIN_NAME;
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/**
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* Regex fragment for checking a canonical nickname.
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*
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* Any non-matching string is not a valid canonical/normalized nickname.
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* Matching strings are valid and canonical form, but may still be
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* unavailable for registration due to blacklisting et.
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*
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* Only the canonical forms should be stored as keys in the database;
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* there are multiple possible denormalized forms for each valid
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* canonical-form name.
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*
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* This, INPUT_FMT and DISPLAY_FMT should not be enclosed in []s.
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*/
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// const CANONICAL_FMT = '[0-9A-Za-z_]{1,' . self::MAX_LEN . '}';
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public const CANONICAL_FMT = self::DISPLAY_FMT;
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/**
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* Regex with non-capturing group that matches whitespace and some
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* characters which are allowed right before an @ or ! when mentioning
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* other users. Like: 'This goes out to:@mmn (@chimo too) (!awwyiss).'
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*
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* FIXME: Make this so you can have multiple whitespace but not multiple
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* parenthesis or something. '(((@n_n@)))' might as well be a smiley.
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*/
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public const BEFORE_MENTIONS = '(?:^|[\s\.\,\:\;\[\(\>]+)';
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public const CHECK_LOCAL_USER = 1;
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public const CHECK_LOCAL_GROUP = 2;
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/**
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* Check if a nickname is valid or throw exceptions if it's not.
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* Can optionally check if the nickname is currently in use
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*
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* @throws NicknameEmptyException
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* @throws NicknameNotAllowedException
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* @throws NicknameTakenException
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* @throws NicknameTooLongException
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*/
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public static function validate(string $nickname, bool $check_already_used = false, int $which = self::CHECK_LOCAL_USER, bool $check_is_allowed = true): bool
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{
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$length = mb_strlen($nickname);
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if ($length < 1) {
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throw new NicknameEmptyException();
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} else {
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if ($length > self::MAX_LEN) {
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throw new NicknameTooLongException();
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} elseif ($check_is_allowed && self::isBlacklisted($nickname)) {
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throw new NicknameNotAllowedException();
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} elseif ($check_already_used) {
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switch ($which) {
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case self::CHECK_LOCAL_USER:
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try {
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$lu = DB::findOneBy('local_user', ['nickname' => $nickname]);
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throw new NicknameTakenException($lu->getActor());
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} catch (NotFoundException) {
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// continue
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} catch (DuplicateFoundException) {
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throw new BugFoundException("Duplicate entry in `local_user` for nickname={$nickname}");
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}
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break;
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// @codeCoverageIgnoreStart
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case self::CHECK_LOCAL_GROUP:
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throw new NotImplementedException();
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break;
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default:
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throw new InvalidArgumentException();
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// @codeCoverageIgnoreEnd
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}
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}
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}
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return true;
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}
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/**
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* Normalize input $nickname to its canonical form and validates it.
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* The canonical form will be returned, or an exception thrown if invalid.
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*
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* @throws NicknameEmptyException
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* @throws NicknameException (base class)
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* @throws NicknameInvalidException
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* @throws NicknameNotAllowedException
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* @throws NicknameTakenException
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* @throws NicknameTooLongException
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*/
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public static function normalize(string $nickname, bool $check_already_used = false, int $which = self::CHECK_LOCAL_USER, bool $check_is_allowed = true): string
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{
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// Nicknames are lower case and without trailing spaces, it's not offensive to sanitize that to the user
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$nickname = trim($nickname);
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$nickname = mb_strtolower($nickname);
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// Anything else would likely be very confusing
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// We could, e.g., do UTF-8 normalization (å to a, etc.) with something like Normalizer::normalize($nickname, Normalizer::FORM_C)
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// We won't as it could confuse tremendously the user, he must know what is valid and should fix his own input
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if (!self::validate(nickname: $nickname, check_already_used: $check_already_used, which: $which, check_is_allowed: $check_is_allowed) || !self::isCanonical($nickname)) {
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throw new NicknameInvalidException();
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}
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return $nickname;
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}
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/**
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* Nice simple check of whether the given string is a valid input nickname,
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* which can be normalized into an internally canonical form.
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*
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* Note that valid nicknames may be in use or blacklisted.
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*
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* @return bool True if nickname is valid. False if invalid (or taken if $check_already_used == true).
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*/
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public static function isValid(string $nickname, bool $check_already_used = false, int $which = self::CHECK_LOCAL_USER, bool $check_is_allowed = true): bool
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{
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try {
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self::normalize(nickname: $nickname, check_already_used: $check_already_used, which: $which, check_is_allowed: $check_is_allowed);
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} catch (NicknameException) {
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return false;
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}
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return true;
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}
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/**
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* Is the given string a valid canonical nickname form?
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*/
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public static function isCanonical(string $nickname): bool
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{
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return preg_match('/^(?:' . self::CANONICAL_FMT . ')$/', $nickname) > 0;
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}
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/**
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* Is the given string in our nickname blacklist?
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*
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* @throws NicknameEmptyException
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* @throws NicknameInvalidException
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* @throws NicknameNotAllowedException
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* @throws NicknameTakenException
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* @throws NicknameTooLongException
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*/
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public static function isBlacklisted(string $nickname): bool
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{
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$reserved = Common::config('nickname', 'blacklist');
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if (empty($reserved)) {
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return false;
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}
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return \in_array(
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$nickname,
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array_merge(
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$reserved,
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F\map(
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$reserved,
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fn ($n) => self::normalize($n, check_already_used: false, check_is_allowed: false),
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),
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),
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);
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}
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}
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