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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2020, Georg Ehrke
*
* @author Georg Ehrke <oc.list@georgehrke.com>
* @author Joas Schilling <coding@schilljs.com>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* 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
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OC;
use OCP\IDBConnection;
use OCP\IEmojiHelper;
class EmojiHelper implements IEmojiHelper {
private IDBConnection $db;
public function __construct(IDBConnection $db) {
$this->db = $db;
}
public function doesPlatformSupportEmoji(): bool {
return $this->db->supports4ByteText() &&
\class_exists(\IntlBreakIterator::class);
}
public function isValidSingleEmoji(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);
// Unicode chars need 2 or more chars
// The characterCount before this loop already validate if is a single emoji
// This condition is to don't continue if non emoji chars
if (strlen($emoji) >= 2) {
// If the current code-point is an emoji or a modifier (like a skin-tone)
// just continue and check the next character
if ($codePointType === \IntlChar::CHAR_CATEGORY_MODIFIER_SYMBOL ||
$codePointType === \IntlChar::CHAR_CATEGORY_MODIFIER_LETTER ||
$codePointType === \IntlChar::CHAR_CATEGORY_OTHER_SYMBOL ||
$codePointType === \IntlChar::CHAR_CATEGORY_FORMAT_CHAR || // i.e. 🏴 🏴
$codePointType === \IntlChar::CHAR_CATEGORY_OTHER_PUNCTUATION || // i.e. ‼️ ⁉️ #⃣
$codePointType === \IntlChar::CHAR_CATEGORY_LOWERCASE_LETTER || // i.e. ℹ️
$codePointType === \IntlChar::CHAR_CATEGORY_MATH_SYMBOL || // i.e. ↔️ ◻️ ⤴️ ⤵️
$codePointType === \IntlChar::CHAR_CATEGORY_ENCLOSING_MARK || // i.e. 0⃣..9⃣
$codePointType === \IntlChar::CHAR_CATEGORY_DECIMAL_DIGIT_NUMBER || // i.e. 0⃣..9⃣
$codePointType === \IntlChar::CHAR_CATEGORY_DASH_PUNCTUATION || // i.e. 〰️
$codePointType === \IntlChar::CHAR_CATEGORY_GENERAL_OTHER_TYPES
) {
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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