89 lines
2.9 KiB
TypeScript
89 lines
2.9 KiB
TypeScript
/*
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* Copyright (C) 2026 Fluxer Contributors
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*
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* This file is part of Fluxer.
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*
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* Fluxer 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 published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Fluxer 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 Fluxer. If not, see <https://www.gnu.org/licenses/>.
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*/
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import MessageFormat from '@messageformat/core';
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import {Logger} from '~/Logger';
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import {type EmailTemplateKey, type EmailTemplateVariables, getLocaleTranslations, hasLocale} from './email_i18n';
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export interface LocalizedEmailTemplate {
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subject: string;
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body: string;
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}
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export class EmailI18nService {
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private readonly defaultLocale = 'en-US';
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private readonly messageFormatCache: Map<string, MessageFormat> = new Map();
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getTemplate<T extends EmailTemplateKey>(
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templateKey: T,
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locale: string | null,
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variables: EmailTemplateVariables[T],
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): LocalizedEmailTemplate {
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const effectiveLocale = this.getEffectiveLocale(locale);
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const translations = getLocaleTranslations(effectiveLocale);
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const fallbackTranslations = getLocaleTranslations(this.defaultLocale);
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const template = translations[templateKey] ?? fallbackTranslations[templateKey];
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if (!template) {
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throw new Error(`Missing email template ${templateKey} for locale ${effectiveLocale}`);
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}
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const subjectMf = this.getMessageFormat(effectiveLocale);
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const subject = subjectMf.compile(template.subject)(variables);
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const bodyMf = this.getMessageFormat(effectiveLocale);
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const body = bodyMf.compile(template.body)(variables);
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return {subject, body};
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}
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formatDate(
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date: Date,
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locale: string | null,
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options: Intl.DateTimeFormatOptions = {dateStyle: 'full', timeStyle: 'short'},
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): string {
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const effectiveLocale = this.getEffectiveLocale(locale);
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return date.toLocaleString(effectiveLocale, options);
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}
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formatNumber(num: number, locale: string | null): string {
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const effectiveLocale = this.getEffectiveLocale(locale);
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return num.toLocaleString(effectiveLocale);
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}
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private getMessageFormat(locale: string): MessageFormat {
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if (!this.messageFormatCache.has(locale)) {
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this.messageFormatCache.set(locale, new MessageFormat(locale));
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}
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return this.messageFormatCache.get(locale)!;
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}
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private getEffectiveLocale(locale: string | null): string {
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if (!locale) {
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return this.defaultLocale;
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}
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if (!hasLocale(locale)) {
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Logger.warn({locale}, 'Unsupported locale for email, falling back to en-US');
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return this.defaultLocale;
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}
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return locale;
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}
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}
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