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- <?php
-
- declare(strict_types=1);
-
- /**
- * @copyright Copyright (c) 2020, Georg Ehrke
- *
- * @author Georg Ehrke <oc.list@georgehrke.com>
- *
- * @license AGPL-3.0
- *
- * This code is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License, version 3,
- * as published by the Free Software Foundation.
- *
- * 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, version 3,
- * along with this program. If not, see <http://www.gnu.org/licenses/>
- *
- */
-
- namespace OCA\UserStatus\Service;
-
- use OCP\IDBConnection;
-
- /**
- * Class EmojiService
- *
- * @package OCA\UserStatus\Service
- */
- class EmojiService {
-
- /** @var IDBConnection */
- private $db;
-
- /**
- * EmojiService constructor.
- *
- * @param IDBConnection $db
- */
- public function __construct(IDBConnection $db) {
- $this->db = $db;
- }
-
- /**
- * @return bool
- */
- public function doesPlatformSupportEmoji(): bool {
- return $this->db->supports4ByteText() &&
- \class_exists(\IntlBreakIterator::class);
- }
-
- /**
- * @param string $emoji
- * @return bool
- */
- public function isValidEmoji(string $emoji): bool {
- $intlBreakIterator = \IntlBreakIterator::createCharacterInstance();
- $intlBreakIterator->setText($emoji);
-
- $characterCount = 0;
- while ($intlBreakIterator->next() !== \IntlBreakIterator::DONE) {
- $characterCount++;
- }
-
- if ($characterCount !== 1) {
- return false;
- }
-
- $codePointIterator = \IntlBreakIterator::createCodePointInstance();
- $codePointIterator->setText($emoji);
-
- foreach ($codePointIterator->getPartsIterator() as $codePoint) {
- $codePointType = \IntlChar::charType($codePoint);
-
- // If the current code-point is an emoji or a modifier (like a skin-tone)
- // just continue and check the next character
- if ($codePointType === \IntlChar::CHAR_CATEGORY_MODIFIER_SYMBOL ||
- $codePointType === \IntlChar::CHAR_CATEGORY_MODIFIER_LETTER ||
- $codePointType === \IntlChar::CHAR_CATEGORY_OTHER_SYMBOL) {
- continue;
- }
-
- // If it's neither a modifier nor an emoji, we only allow
- // a zero-width-joiner or a variation selector 16
- $codePointValue = \IntlChar::ord($codePoint);
- if ($codePointValue === 8205 || $codePointValue === 65039) {
- continue;
- }
-
- return false;
- }
-
- return true;
- }
- }
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