fix: translation

src/lib/server/LanguageService.ts

@@ -0,0 +1,103 @@
+import type { TolgeeStaticData } from '@tolgee/svelte'
+import { env } from '$env/dynamic/private'
+import { TOLGEE_API_KEY, TOLGEE_API_URL } from '$env/static/private'
+import { loadAsync } from 'jszip'
+
+class TranslationCacheItem {
+  constructor(
+    public translastions: TolgeeStaticData,
+    public timestamp: number,
+  ) {}
+
+  get isExpired(): boolean {
+    const now = Date.now()
+
+    const TTL = Number(env.PRIVATE_TRANSLATION_CACHE_TTL)
+
+    if (Number.isNaN(TTL)) return false
+
+    return now - this.timestamp > TTL * 1000
+  }
+}
+
+class LanguageService {
+  protected cache: Record<string, TranslationCacheItem> = {}
+
+  async getTranslations(
+    languageCodes: string[],
+  ): Promise<Record<string, TolgeeStaticData>> {
+    const languageCodesToFetch = new Set<string>()
+
+    const result: Record<string, TolgeeStaticData> = {}
+
+    for (const lang of languageCodes) {
+      const cacheItem = this.cache[lang]
+
+      if (!cacheItem || cacheItem.isExpired) {
+        languageCodesToFetch.add(lang)
+        continue
+      }
+
+      Object.assign(result, { [lang]: cacheItem.translastions })
+    }
+
+    if (languageCodesToFetch.size === 0) {
+      return result
+    }
+
+    const freshTranslations = await this.fetchTranslations(
+      Array.from(languageCodesToFetch),
+    )
+
+    for (const langKey of Object.keys(freshTranslations)) {
+      if (langKey in this.cache) {
+        delete this.cache[langKey]
+      }
+      this.cache[langKey] = new TranslationCacheItem(
+        freshTranslations[langKey],
+        Date.now(),
+      )
+      result[langKey] = Object.assign(freshTranslations[langKey])
+    }
+
+    return result
+  }
+
+  protected async fetchTranslations(languageCodes: string | string[]) {
+    const url = new URL(`${TOLGEE_API_URL}/v2/projects/2/export`)
+
+    url.searchParams.append('format', 'JSON')
+    url.searchParams.append('zip', 'true')
+    url.searchParams.append('supportArrays', 'true')
+
+    for (const lang of languageCodes) {
+      url.searchParams.append('languages', lang)
+    }
+
+    const response = await fetch(url, {
+      method: 'GET',
+      headers: {
+        'X-API-Key': TOLGEE_API_KEY,
+        Accept: 'application/*',
+      },
+    })
+
+    const zippedBuffer = await response.arrayBuffer()
+
+    const zip = await loadAsync(zippedBuffer)
+
+    const translations: Record<string, TolgeeStaticData> = {}
+
+    for (const [filename, file] of Object.entries(zip.files)) {
+      if (!file.dir && filename.endsWith('.json')) {
+        const content = await file.async('string')
+        const locale = filename.replace('.json', '')
+        translations[locale] = JSON.parse(content)
+      }
+    }
+
+    return translations
+  }
+}
+
+export const languageService = new LanguageService()