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| 1 | <?php |
| 2 | |
| 3 | // {{{ License |
| 4 | |
| 5 | // This file is part of GNU social - https://www.gnu.org/software/social |
| 6 | // |
| 7 | // GNU social is free software: you can redistribute it and/or modify |
| 8 | // it under the terms of the GNU Affero General Public License as published by |
| 9 | // the Free Software Foundation, either version 3 of the License, or |
| 10 | // (at your option) any later version. |
| 11 | // |
| 12 | // GNU social is distributed in the hope that it will be useful, |
| 13 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | // GNU Affero General Public License for more details. |
| 16 | // |
| 17 | // You should have received a copy of the GNU Affero General Public License |
| 18 | // along with GNU social. If not, see <http://www.gnu.org/licenses/>. |
| 19 | |
| 20 | // }}} |
| 21 | |
| 22 | namespace App\Util; |
| 23 | |
| 24 | use App\Entity\LocalUser; |
| 25 | use App\Util\Exception\NicknameBlacklistedException; |
| 26 | use App\Util\Exception\NicknameEmptyException; |
| 27 | use App\Util\Exception\NicknameException; |
| 28 | use App\Util\Exception\NicknameInvalidException; |
| 29 | use App\Util\Exception\NicknamePathCollisionException; |
| 30 | use App\Util\Exception\NicknameReservedException; |
| 31 | use App\Util\Exception\NicknameTakenException; |
| 32 | use App\Util\Exception\NicknameTooLongException; |
| 33 | use App\Util\Exception\NicknameTooShortException; |
| 34 | use Functional as F; |
| 35 | use Normalizer; |
| 36 | |
| 37 | /** |
| 38 | * Nickname validation |
| 39 | * |
| 40 | * @category Validation |
| 41 | * @package GNUsocial |
| 42 | * |
| 43 | * @author Zach Copley <zach@status.net> |
| 44 | * @copyright 2010 StatusNet Inc. |
| 45 | * @author Brion Vibber <brion@pobox.com> |
| 46 | * @author Mikael Nordfeldth <mmn@hethane.se> |
| 47 | * @author Nym Coy <nymcoy@gmail.com> |
| 48 | * @copyright 2009-2014 Free Software Foundation, Inc http://www.fsf.org |
| 49 | * @auuthor Daniel Supernault <danielsupernault@gmail.com> |
| 50 | * @auuthor Diogo Cordeiro <diogo@fc.up.pt> |
| 51 | * |
| 52 | * @author Hugo Sales <hugo@hsal.es> |
| 53 | * @copyright 2018-2021 Free Software Foundation, Inc http://www.fsf.org |
| 54 | * @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later |
| 55 | */ |
| 56 | class Nickname |
| 57 | { |
| 58 | /** |
| 59 | * Regex fragment for pulling a formated nickname *OR* ID number. |
| 60 | * Suitable for router def of 'id' parameters on API actions. |
| 61 | * |
| 62 | * Not guaranteed to be valid after normalization; run the string through |
| 63 | * Nickname::normalize() to get the canonical form, or Nickname::isValid() |
| 64 | * if you just need to check if it's properly formatted. |
| 65 | * |
| 66 | * This, DISPLAY_FMT, and CANONICAL_FMT should not be enclosed in []s. |
| 67 | * |
| 68 | * @fixme would prefer to define in reference to the other constants |
| 69 | */ |
| 70 | const INPUT_FMT = '(?:[0-9]+|[0-9a-zA-Z_]{1,64})'; |
| 71 | |
| 72 | /** |
| 73 | * Regex fragment for acceptable user-formatted variant of a nickname. |
| 74 | * |
| 75 | * This includes some chars such as underscore which will be removed |
| 76 | * from the normalized canonical form, but still must fit within |
| 77 | * field length limits. |
| 78 | * |
| 79 | * Not guaranteed to be valid after normalization; run the string through |
| 80 | * Nickname::normalize() to get the canonical form, or Nickname::isValid() |
| 81 | * if you just need to check if it's properly formatted. |
| 82 | * |
| 83 | * This, INPUT_FMT and CANONICAL_FMT should not be enclosed in []s. |
| 84 | */ |
| 85 | const DISPLAY_FMT = '[0-9a-zA-Z_]{1,64}'; |
| 86 | |
| 87 | /** |
| 88 | * Simplified regex fragment for acceptable full WebFinger ID of a user |
| 89 | * |
| 90 | * We could probably use an email regex here, but mainly we are interested |
| 91 | * in matching it in our URLs, like https://social.example/user@example.com |
| 92 | */ |
| 93 | const WEBFINGER_FMT = '(?:\w+[\w\-\_\.]*)?\w+\@' . URL_REGEX_DOMAIN_NAME; |
| 94 | |
| 95 | /** |
| 96 | * Regex fragment for checking a canonical nickname. |
| 97 | * |
| 98 | * Any non-matching string is not a valid canonical/normalized nickname. |
| 99 | * Matching strings are valid and canonical form, but may still be |
| 100 | * unavailable for registration due to blacklisting et. |
| 101 | * |
| 102 | * Only the canonical forms should be stored as keys in the database; |
| 103 | * there are multiple possible denormalized forms for each valid |
| 104 | * canonical-form name. |
| 105 | * |
| 106 | * This, INPUT_FMT and DISPLAY_FMT should not be enclosed in []s. |
| 107 | */ |
| 108 | const CANONICAL_FMT = '[0-9a-z]{1,64}'; |
| 109 | |
| 110 | /** |
| 111 | * Maximum number of characters in a canonical-form nickname. Changes must validate regexs |
| 112 | */ |
| 113 | const MAX_LEN = 64; |
| 114 | |
| 115 | /** |
| 116 | * Regex with non-capturing group that matches whitespace and some |
| 117 | * characters which are allowed right before an @ or ! when mentioning |
| 118 | * other users. Like: 'This goes out to:@mmn (@chimo too) (!awwyiss).' |
| 119 | * |
| 120 | * FIXME: Make this so you can have multiple whitespace but not multiple |
| 121 | * parenthesis or something. '(((@n_n@)))' might as well be a smiley. |
| 122 | */ |
| 123 | const BEFORE_MENTIONS = '(?:^|[\s\.\,\:\;\[\(]+)'; |
| 124 | |
| 125 | const CHECK_LOCAL_USER = 1; |
| 126 | const CHECK_LOCAL_GROUP = 2; |
| 127 | |
| 128 | /** |
| 129 | * Check if a nickname is valid or throw exceptions if it's not. |
| 130 | * Can optionally check if the nickname is currently in use |
| 131 | */ |
| 132 | public static function validate(string $nickname, bool $check_already_used = false, int $which = self::CHECK_LOCAL_USER) |
| 133 | { |
| 134 | $nickname = trim($nickname); |
| 135 | $length = mb_strlen($nickname); |
| 136 | |
| 137 | if ($length < 1) { |
| 138 | throw new NicknameEmptyException(); |
| 139 | } elseif ($length < Common::config('nickname', 'min_length')) { |
| 140 | // dd($nickname, $length, Common::config('nickname', 'min_length')); |
| 141 | throw new NicknameTooShortException(); |
| 142 | } else { |
| 143 | if ($length > self::MAX_LEN) { |
| 144 | throw new NicknameTooLongException(); |
| 145 | } elseif (self::isReserved($nickname) || Common::isSystemPath($nickname)) { |
| 146 | throw new NicknameReservedException(); |
| 147 | } elseif ($check_already_used) { |
| 148 | switch ($which) { |
| 149 | case self::CHECK_LOCAL_USER: |
| 150 | $lu = LocalUser::findByNicknameOrEmail($nickname, email: ''); |
| 151 | if ($lu !== null) { |
| 152 | throw new NicknameTakenException($lu->getActor()); |
| 153 | } |
| 154 | break; |
| 155 | // @codeCoverageIgnoreStart |
| 156 | case self::CHECK_LOCAL_GROUP: |
| 157 | throw new \NotImplementedException(); |
| 158 | break; |
| 159 | default: |
| 160 | throw new \InvalidArgumentException(); |
| 161 | // @codeCoverageIgnoreEnd |
| 162 | } |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | return $nickname; |
| 167 | } |
| 168 | |
| 169 | /** |
| 170 | * Normalize an input $nickname, and normalize it to its canonical form. |
| 171 | * The canonical form will be returned, or an exception thrown if invalid. |
| 172 | * |
| 173 | * @throws NicknameException (base class) |
| 174 | * @throws NicknameBlacklistedException |
| 175 | * @throws NicknameEmptyException |
| 176 | * @throws NicknameInvalidException |
| 177 | * @throws NicknamePathCollisionException |
| 178 | * @throws NicknameTakenException |
| 179 | * @throws NicknameTooLongException |
| 180 | * @throws NicknameTooShortException |
| 181 | */ |
| 182 | public static function normalize(string $nickname, bool $check_already_used = true, bool $checking_reserved = false): string |
| 183 | { |
| 184 | if (!$checking_reserved) { |
| 185 | $nickname = self::validate($nickname, $check_already_used); |
| 186 | } |
| 187 | |
| 188 | $nickname = trim($nickname); |
| 189 | $nickname = str_replace('_', '', $nickname); |
| 190 | $nickname = mb_strtolower($nickname); |
| 191 | $nickname = Normalizer::normalize($nickname, Normalizer::FORM_C); |
| 192 | if (!self::isCanonical($nickname) && !filter_var($nickname, FILTER_VALIDATE_EMAIL)) { |
| 193 | throw new NicknameInvalidException(); |
| 194 | } |
| 195 | |
| 196 | return $nickname; |
| 197 | } |
| 198 | |
| 199 | /** |
| 200 | * Nice simple check of whether the given string is a valid input nickname, |
| 201 | * which can be normalized into an internally canonical form. |
| 202 | * |
| 203 | * Note that valid nicknames may be in use or reserved. |
| 204 | * |
| 205 | * @return bool True if nickname is valid. False if invalid (or taken if $check_already_used == true). |
| 206 | */ |
| 207 | public static function isValid(string $nickname, bool $check_already_used = true): bool |
| 208 | { |
| 209 | try { |
| 210 | self::normalize($nickname, $check_already_used); |
| 211 | } catch (NicknameException $e) { |
| 212 | return false; |
| 213 | } |
| 214 | |
| 215 | return true; |
| 216 | } |
| 217 | |
| 218 | /** |
| 219 | * Is the given string a valid canonical nickname form? |
| 220 | */ |
| 221 | public static function isCanonical(string $nickname): bool |
| 222 | { |
| 223 | return preg_match('/^(?:' . self::CANONICAL_FMT . ')$/', $nickname); |
| 224 | } |
| 225 | |
| 226 | /** |
| 227 | * Is the given string in our nickname blacklist? |
| 228 | */ |
| 229 | public static function isReserved(string $nickname): bool |
| 230 | { |
| 231 | $reserved = Common::config('nickname', 'reserved'); |
| 232 | if (empty($reserved)) { |
| 233 | return false; |
| 234 | } |
| 235 | return in_array($nickname, array_merge($reserved, F\map($reserved, function ($n) { |
| 236 | return self::normalize($n, check_already_used: false, checking_reserved: true); |
| 237 | }))); |
| 238 | } |
| 239 | } |