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| 1 | +<?php |
| 2 | + |
| 3 | +declare(strict_types=1); |
| 4 | + |
| 5 | +/** |
| 6 | + * @copyright Copyright (c) 2020, Georg Ehrke |
| 7 | + * |
| 8 | + * @author Georg Ehrke <oc.list@georgehrke.com> |
| 9 | + * @author Joas Schilling <coding@schilljs.com> |
| 10 | + * |
| 11 | + * @license GNU AGPL version 3 or any later version |
| 12 | + * |
| 13 | + * This program is free software: you can redistribute it and/or modify |
| 14 | + * it under the terms of the GNU Affero General Public License as |
| 15 | + * published by the Free Software Foundation, either version 3 of the |
| 16 | + * License, or (at your option) any later version. |
| 17 | + * |
| 18 | + * This program is distributed in the hope that it will be useful, |
| 19 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 21 | + * GNU Affero General Public License for more details. |
| 22 | + * |
| 23 | + * You should have received a copy of the GNU Affero General Public License |
| 24 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 25 | + * |
| 26 | + */ |
| 27 | +namespace OC\Comments; |
| 28 | + |
| 29 | +use OCP\IDBConnection; |
| 30 | + |
| 31 | +/** |
| 32 | + * Copied OCA\UserStatus\Service\EmojiService |
| 33 | + * Needs to be unified later |
| 34 | + */ |
| 35 | +class EmojiHelper { |
| 36 | + |
| 37 | + /** @var IDBConnection */ |
| 38 | + private $db; |
| 39 | + |
| 40 | + /** |
| 41 | + * EmojiService constructor. |
| 42 | + * |
| 43 | + * @param IDBConnection $db |
| 44 | + */ |
| 45 | + public function __construct(IDBConnection $db) { |
| 46 | + $this->db = $db; |
| 47 | + } |
| 48 | + |
| 49 | + /** |
| 50 | + * @return bool |
| 51 | + */ |
| 52 | + public function doesPlatformSupportEmoji(): bool { |
| 53 | + return $this->db->supports4ByteText() && |
| 54 | + \class_exists(\IntlBreakIterator::class); |
| 55 | + } |
| 56 | + |
| 57 | + /** |
| 58 | + * @param string $emoji |
| 59 | + * @return bool |
| 60 | + */ |
| 61 | + public function isValidEmoji(string $emoji): bool { |
| 62 | + $intlBreakIterator = \IntlBreakIterator::createCharacterInstance(); |
| 63 | + $intlBreakIterator->setText($emoji); |
| 64 | + |
| 65 | + $characterCount = 0; |
| 66 | + while ($intlBreakIterator->next() !== \IntlBreakIterator::DONE) { |
| 67 | + $characterCount++; |
| 68 | + } |
| 69 | + |
| 70 | + if ($characterCount !== 1) { |
| 71 | + return false; |
| 72 | + } |
| 73 | + |
| 74 | + $codePointIterator = \IntlBreakIterator::createCodePointInstance(); |
| 75 | + $codePointIterator->setText($emoji); |
| 76 | + |
| 77 | + foreach ($codePointIterator->getPartsIterator() as $codePoint) { |
| 78 | + $codePointType = \IntlChar::charType($codePoint); |
| 79 | + |
| 80 | + // If the current code-point is an emoji or a modifier (like a skin-tone) |
| 81 | + // just continue and check the next character |
| 82 | + if ($codePointType === \IntlChar::CHAR_CATEGORY_MODIFIER_SYMBOL || |
| 83 | + $codePointType === \IntlChar::CHAR_CATEGORY_MODIFIER_LETTER || |
| 84 | + $codePointType === \IntlChar::CHAR_CATEGORY_OTHER_SYMBOL || |
| 85 | + $codePointType === \IntlChar::CHAR_CATEGORY_GENERAL_OTHER_TYPES) { |
| 86 | + continue; |
| 87 | + } |
| 88 | + |
| 89 | + // If it's neither a modifier nor an emoji, we only allow |
| 90 | + // a zero-width-joiner or a variation selector 16 |
| 91 | + $codePointValue = \IntlChar::ord($codePoint); |
| 92 | + if ($codePointValue === 8205 || $codePointValue === 65039) { |
| 93 | + continue; |
| 94 | + } |
| 95 | + |
| 96 | + return false; |
| 97 | + } |
| 98 | + |
| 99 | + return true; |
| 100 | + } |
| 101 | +} |
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