refactor progress

packages/sms/src/SmsVerificationUtils.tsx

@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2026 Fluxer Contributors
+ *
+ * This file is part of Fluxer.
+ *
+ * Fluxer 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.
+ *
+ * Fluxer 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 Fluxer. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import crypto from 'node:crypto';
+import {
+	SMS_MASK_VISIBLE_PREFIX_LENGTH,
+	SMS_VERIFICATION_CACHE_PREFIX,
+	SMS_VERIFICATION_CODE_LENGTH,
+	SMS_VERIFICATION_MESSAGE_TEMPLATE,
+} from '@fluxer/constants/src/SmsVerificationConstants';
+
+export function buildSmsVerificationCacheKey(phone: string): string {
+	return `${SMS_VERIFICATION_CACHE_PREFIX}${phone}`;
+}
+
+export function generateSmsVerificationCode(): string {
+	const maxCodeValue = 10 ** SMS_VERIFICATION_CODE_LENGTH;
+	const value = crypto.randomInt(0, maxCodeValue);
+	return value.toString().padStart(SMS_VERIFICATION_CODE_LENGTH, '0');
+}
+
+export function buildSmsVerificationMessage(code: string, ttlSeconds: number): string {
+	const ttlMinutes = Math.max(1, Math.floor(ttlSeconds / 60));
+	return SMS_VERIFICATION_MESSAGE_TEMPLATE.replace('{code}', code).replace('{minutes}', String(ttlMinutes));
+}
+
+export function timingSafeEqualStrings(left: string, right: string): boolean {
+	const leftBuffer = Buffer.from(left);
+	const rightBuffer = Buffer.from(right);
+
+	if (leftBuffer.length !== rightBuffer.length) {
+		return false;
+	}
+
+	return crypto.timingSafeEqual(leftBuffer, rightBuffer);
+}
+
+export function maskPhoneNumber(phone: string): string {
+	if (phone.length <= SMS_MASK_VISIBLE_PREFIX_LENGTH) {
+		return `${phone}***`;
+	}
+	return `${phone.slice(0, SMS_MASK_VISIBLE_PREFIX_LENGTH)}***`;
+}