feat: images

internal/components/images/controller.go

@@ -0,0 +1,49 @@
+package images
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"strings"
+)
+
+var ErrNotAnImage = errors.New("not an image")
+
+func (s *Service) getMime(path string) (mimeType string, err error) {
+	info, err := s.fs.Stat(path)
+	if err != nil {
+		err = fmt.Errorf("image file info could not be fetched")
+	}
+
+	if mimer, ok := info.(interface{ ContentType() string }); ok {
+		mimeType = mimer.ContentType()
+	}
+
+	return
+}
+
+func (s *Service) GetImage(ctx context.Context, uid string) (img io.Reader, mimeType string, err error) {
+	path, err := PathFromUID(uid)
+	if err != nil {
+		err = fmt.Errorf("could not get path: %w", err)
+		return
+	}
+	mimeType, err = s.getMime(path)
+	if err != nil {
+		return
+	}
+
+	if !strings.HasPrefix(mimeType, "image") {
+		err = ErrNotAnImage
+		return
+	}
+
+	file, err := s.fs.Read(path)
+	if err != nil {
+		err = fmt.Errorf("image file could not be fetched")
+	}
+
+	return bytes.NewBuffer(file), mimeType, err
+}

internal/components/images/resorce.go

@@ -0,0 +1,18 @@
+package images
+
+import "os"
+
+type Service struct {
+	fs fileSystem
+}
+
+func New(fs fileSystem) *Service {
+	return &Service{
+		fs: fs,
+	}
+}
+
+type fileSystem interface {
+	Read(path string) ([]byte, error)
+	Stat(path string) (os.FileInfo, error)
+}