feat: i18n service to query xml files

apps/api/src/app/account/account.module.ts

@@ -11,6 +11,7 @@ import { Module } from '@nestjs/common';
 
 import { AccountController } from './account.controller';
 import { AccountService } from './account.service';
+import { I18nModule } from '@ghostfolio/api/services/i18n/i18n.module';
 
 @Module({
   controllers: [AccountController],
@@ -21,6 +22,7 @@ import { AccountService } from './account.service';
     DataProviderModule,
     ExchangeRateDataModule,
     ImpersonationModule,
+    I18nModule,
     PortfolioModule,
     PrismaModule,
     RedisCacheModule,

apps/api/src/services/i18n/i18n.module.ts

@@ -0,0 +1,9 @@
+import { Module } from '@nestjs/common';
+
+import { I18nService } from './i18n.service';
+
+@Module({
+  providers: [I18nService],
+  exports: [I18nService]
+})
+export class I18nModule {}

apps/api/src/services/i18n/i18n.service.ts

@@ -0,0 +1,59 @@
+import * as fs from 'fs';
+import { join } from 'path';
+import { Injectable } from '@nestjs/common';
+import * as cheerio from 'cheerio';
+
+@Injectable()
+export class I18nService {
+  private localesPath = join(__dirname, 'assets/locales/');
+  private localeRegex = /^messages\.[a-z]{2}\.xlf$/;
+  private translations: { [locale: string]: cheerio.CheerioAPI } = {};
+
+  constructor() {
+    this.loadFiles();
+  }
+
+  public getTranslation({
+    id,
+    locale
+  }: {
+    id: string;
+    locale: string;
+  }): string {
+    const $ = this.translations[locale];
+    if (!$) {
+      throw new Error(`Translation not found for locale '${locale}'`);
+    }
+
+    const translatedText = $(`trans-unit[id="${id}"] > target`).text();
+    if (!translatedText) {
+      throw new Error(
+        `Translation not found for id '${id}' in locale '${locale}'`
+      );
+    }
+
+    return translatedText;
+  }
+
+  private loadFiles() {
+    try {
+      const files = fs.readdirSync(this.localesPath, 'utf-8');
+      for (const file of files) {
+        if (!this.localeRegex.test(file)) continue;
+        if (!fs.existsSync(`${this.localesPath}${file}`)) {
+          throw new Error(`File: ${file} not found`);
+        } else {
+          const xmlData = fs.readFileSync(`${this.localesPath}${file}`, 'utf8');
+          this.translations[file.split('.')[1]] = this.parseXml(xmlData);
+        }
+      }
+    } catch (error) {
+      console.log(error);
+    }
+  }
+
+  private parseXml(xmlData: string): cheerio.CheerioAPI {
+    const selectorFn = cheerio.load(xmlData, { xmlMode: true });
+    return selectorFn;
+  }
+}