display files with cache image

backend/internal/service/file.go

@@ -47,6 +47,17 @@ func (s *FileService) Upload(file *multipart.FileHeader) (*model.UploadResult, e
 
 	checksum := hex.EncodeToString(CreateSHA256Hash(data))
 
+	existing, err := s.queries.FindDuplicateByChecksum(context.Background(), checksum)
+	if err == nil && existing.ID != "" {
+		os.Remove(dst)
+		return &model.UploadResult{
+			ID:       existing.ID,
+			Name:     existing.Name,
+			Path:     existing.StorageKey,
+			MimeType: existing.MimeType,
+		}, nil
+	}
+
 	dbFile, err := s.queries.CreateFile(context.Background(), db.CreateFileParams{
 		Name:       file.Filename,
 		MimeType:   file.Header.Get("Content-Type"),
@@ -280,6 +291,13 @@ func (s *FileService) GetBestThumbnail(fileID, preferredLabel string) *model.Thu
 	return fallback
 }
 
+func (s *FileService) FindDuplicatesByNameSize(name string, size int64) ([]db.FindDuplicatesByNameSizeRow, error) {
+	return s.queries.FindDuplicatesByNameSize(context.Background(), db.FindDuplicatesByNameSizeParams{
+		Name: name,
+		Size: size,
+	})
+}
+
 func dbToModel(f db.File, dbTags []db.Tag) model.File {
 	tags := make([]model.Tag, len(dbTags))
 	for i, t := range dbTags {

backend/internal/service/url.go

@@ -9,12 +9,20 @@ import (
 )
 
 type URLService struct {
-	secret     string
-	serverHost string
+	secret         string
+	serverHost     string
+	expiryDuration time.Duration
 }
 
-func NewURLService(secret, serverHost string) *URLService {
-	return &URLService{secret: secret, serverHost: serverHost}
+func NewURLService(secret, serverHost string, expiryMinutes int) *URLService {
+	if expiryMinutes <= 0 {
+		expiryMinutes = 60
+	}
+	return &URLService{
+		secret:         secret,
+		serverHost:     serverHost,
+		expiryDuration: time.Duration(expiryMinutes) * time.Minute,
+	}
 }
 
 func (s *URLService) sign(fileID string, expires int64) string {
@@ -25,7 +33,7 @@ func (s *URLService) sign(fileID string, expires int64) string {
 }
 
 func (s *URLService) GenerateDownloadURL(fileUUID string) string {
-	expires := time.Now().Add(10 * time.Minute).Unix()
+	expires := time.Now().Add(s.expiryDuration).Unix()
 	sig := s.sign(fileUUID, expires)
 
 	return fmt.Sprintf(
@@ -38,7 +46,7 @@ func (s *URLService) GenerateDownloadURL(fileUUID string) string {
 }
 
 func (s *URLService) GenerateThumbnailURL(thumbUUID string) string {
-	expires := time.Now().Add(10 * time.Minute).Unix()
+	expires := time.Now().Add(s.expiryDuration).Unix()
 	sig := s.sign(thumbUUID, expires)
 
 	return fmt.Sprintf(