initial commit

domain/service.download.go

@@ -0,0 +1,49 @@
+package domain
+
+import (
+	"errors"
+)
+
+var (
+	ErrSoftwareNotFound = errors.New("software not found")
+	ErrNoReleasesFound  = errors.New("no releases found for software")
+	ErrReleaseNotFound  = errors.New("release not found for software and version")
+)
+
+type DownloadService interface {
+	GetLatestRelease(softwareName string) (*Release, error)
+	GetSpecificRelease(softwareName string, version string) (*Release, error)
+}
+
+type downloadService struct {
+	softwareRepository SoftwareRepository
+	releaseRepository  ReleaseRepository
+}
+
+func (s *downloadService) GetLatestRelease(softwareName string) (*Release, error) {
+	software, err := s.softwareRepository.GetByName(softwareName)
+	if err != nil {
+		return nil, ErrSoftwareNotFound
+	}
+
+	release, err := s.releaseRepository.FindLatestBySoftwareID(software.ID)
+	if err != nil {
+		return nil, ErrNoReleasesFound
+	}
+
+	return release, nil
+}
+
+func (s *downloadService) GetSpecificRelease(softwareName string, version string) (*Release, error) {
+	software, err := s.softwareRepository.GetByName(softwareName)
+	if err != nil {
+		return nil, ErrSoftwareNotFound
+	}
+
+	release, err := s.releaseRepository.FindBySoftwareIDAndVersion(software.ID, version)
+	if err != nil {
+		return nil, ErrReleaseNotFound
+	}
+
+	return release, nil
+}