Initial open source release

internal/app/langpack/service.go

@@ -0,0 +1,53 @@
+package langpack
+
+import (
+	"context"
+
+	"telesrv/internal/domain"
+	"telesrv/internal/store"
+)
+
+// Service 提供客户端语言包查询。
+type Service struct {
+	packs store.LangPackStore
+}
+
+// NewService 创建 langpack 服务。
+func NewService(packs store.LangPackStore) *Service {
+	return &Service{packs: packs}
+}
+
+// GetLangPack 返回完整语言包。
+func (s *Service) GetLangPack(ctx context.Context, langPack, langCode string) (domain.LangPack, error) {
+	return s.GetDifference(ctx, langPack, langCode, 0)
+}
+
+// GetDifference 返回从 fromVersion 到当前版本的语言包差异。
+func (s *Service) GetDifference(ctx context.Context, langPack, langCode string, fromVersion int) (domain.LangPack, error) {
+	if s == nil || s.packs == nil {
+		return domain.LangPack{LangPack: langPack, LangCode: langCode, FromVersion: fromVersion}, nil
+	}
+	return s.packs.GetPack(ctx, normalizePack(langPack), normalizeCode(langCode), fromVersion)
+}
+
+// GetStrings 返回指定 key 的语言包字符串。
+func (s *Service) GetStrings(ctx context.Context, langPack, langCode string, keys []string) (domain.LangPack, error) {
+	if s == nil || s.packs == nil {
+		return domain.LangPack{LangPack: langPack, LangCode: langCode}, nil
+	}
+	return s.packs.GetStrings(ctx, normalizePack(langPack), normalizeCode(langCode), keys)
+}
+
+func normalizePack(langPack string) string {
+	if langPack == "" {
+		return "tdesktop"
+	}
+	return langPack
+}
+
+func normalizeCode(langCode string) string {
+	if langCode == "" {
+		return "en"
+	}
+	return langCode
+}