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<?php
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declare(strict_types=1);
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/**
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* SPDX-FileCopyrightText: 2020 Nextcloud GmbH and Nextcloud contributors
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* SPDX-License-Identifier: AGPL-3.0-or-later
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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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