mirror of https://github.com/nextcloud/server
98 lines
3.4 KiB
PHP
98 lines
3.4 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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* @author Joas Schilling <coding@schilljs.com>
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program 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
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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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
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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 OC;
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use OCP\IDBConnection;
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use OCP\IEmojiHelper;
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class EmojiHelper implements IEmojiHelper {
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private IDBConnection $db;
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public function __construct(IDBConnection $db) {
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$this->db = $db;
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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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public function isValidSingleEmoji(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($codePoint);
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// Unicode chars need 2 or more chars
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// The characterCount before this loop already validate if is a single emoji
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// This condition is to don't continue if non emoji chars
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if (strlen($emoji) >= 2) {
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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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$codePointType === \IntlChar::CHAR_CATEGORY_OTHER_SYMBOL ||
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$codePointType === \IntlChar::CHAR_CATEGORY_FORMAT_CHAR || // i.e. 🏴 🏴
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$codePointType === \IntlChar::CHAR_CATEGORY_OTHER_PUNCTUATION || // i.e. ‼️ ⁉️ #⃣
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$codePointType === \IntlChar::CHAR_CATEGORY_LOWERCASE_LETTER || // i.e. ℹ️
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$codePointType === \IntlChar::CHAR_CATEGORY_MATH_SYMBOL || // i.e. ↔️ ◻️ ⤴️ ⤵️
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$codePointType === \IntlChar::CHAR_CATEGORY_ENCLOSING_MARK || // i.e. 0⃣..9⃣
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$codePointType === \IntlChar::CHAR_CATEGORY_DECIMAL_DIGIT_NUMBER || // i.e. 0⃣..9⃣
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$codePointType === \IntlChar::CHAR_CATEGORY_DASH_PUNCTUATION || // i.e. 〰️
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$codePointType === \IntlChar::CHAR_CATEGORY_GENERAL_OTHER_TYPES
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) {
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continue;
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}
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}
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// If it's neither a modifier nor an emoji, we only allow
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// a zero-width-joiner or a variation selector 16
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$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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