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