100 lines
2.3 KiB
Go
100 lines
2.3 KiB
Go
package media
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import (
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"context"
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"errors"
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"fmt"
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"io"
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"github.com/google/uuid"
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)
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var (
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ErrFileTooLarge = errors.New("file exceeds the maximum allowed size")
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ErrUnsupportedType = errors.New("unsupported file type")
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)
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// allowedTypes maps accepted MIME types to a safe file extension. Anything
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// not in this list is rejected -- uploads are never trusted to declare
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// their own extension.
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var allowedTypes = map[string]string{
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"image/jpeg": ".jpg",
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"image/png": ".png",
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"image/webp": ".webp",
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"image/gif": ".gif",
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"video/mp4": ".mp4",
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"video/webm": ".webm",
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}
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type Service struct {
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repo Repository
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storage Storage
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maxSizeByte int64
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}
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func NewService(repo Repository, storage Storage, maxSizeBytes int64) *Service {
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return &Service{repo: repo, storage: storage, maxSizeByte: maxSizeBytes}
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}
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func (s *Service) List(ctx context.Context) ([]*Media, error) {
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return s.repo.List(ctx)
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}
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func (s *Service) Get(ctx context.Context, id uuid.UUID) (*Media, error) {
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return s.repo.FindByID(ctx, id)
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}
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func (s *Service) Upload(ctx context.Context, filename string, reader io.Reader, size int64, contentType, altText string) (*Media, error) {
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if size > s.maxSizeByte {
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return nil, ErrFileTooLarge
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}
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ext, ok := allowedTypes[contentType]
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if !ok {
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return nil, ErrUnsupportedType
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}
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key := uuid.NewString() + ext
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url, err := s.storage.Save(ctx, key, reader, size, contentType)
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if err != nil {
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return nil, fmt.Errorf("save file: %w", err)
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}
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m := &Media{
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ID: uuid.New(),
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Filename: filename,
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StorageKey: key,
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URL: url,
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MimeType: contentType,
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SizeBytes: size,
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AltText: altText,
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}
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if err := s.repo.Create(ctx, m); err != nil {
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_ = s.storage.Delete(ctx, key)
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return nil, fmt.Errorf("save metadata: %w", err)
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}
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return m, nil
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}
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func (s *Service) UpdateAltText(ctx context.Context, id uuid.UUID, altText string) (*Media, error) {
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m, err := s.repo.FindByID(ctx, id)
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if err != nil {
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return nil, err
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}
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m.AltText = altText
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if err := s.repo.Update(ctx, m); err != nil {
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return nil, err
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}
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return m, nil
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}
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func (s *Service) Delete(ctx context.Context, id uuid.UUID) error {
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m, err := s.repo.FindByID(ctx, id)
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if err != nil {
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return err
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}
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if err := s.storage.Delete(ctx, m.StorageKey); err != nil {
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return fmt.Errorf("delete stored file: %w", err)
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}
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return s.repo.Delete(ctx, id)
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}
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