return very partial image on first upload

internal/media/media.go

@@ -1,7 +1,34 @@
 package media
 
-import gtsmodel "github.com/superseriousbusiness/gotosocial/internal/db/bundb/migrations/20211113114307_init"
+import (
+	"fmt"
+	"sync"
+
+	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
+)
 
 type Media struct {
-	Attachment *gtsmodel.MediaAttachment
+	mu         sync.Mutex
+	attachment *gtsmodel.MediaAttachment
+	rawData    []byte
+}
+
+func (m *Media) Thumb() (*ImageMeta, error) {
+	m.mu.Lock()
+	thumb, err := deriveThumbnail(m.rawData, m.attachment.File.ContentType)
+	if err != nil {
+		return nil, fmt.Errorf("error deriving thumbnail: %s", err)
+	}
+	m.attachment.Blurhash = thumb.blurhash
+	aaaaaaaaaaaaaaaa
+}
+
+func (m *Media) PreLoad() {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+}
+
+func (m *Media) Load() {
+	m.mu.Lock()
+	defer m.mu.Unlock()
 }