big update: added reactions, groups, media share

server/internal/media/storage.go

@@ -0,0 +1,19 @@
+// Package media provides file storage and image thumbnail generation
+// for attachments shared in conversations.
+package media
+
+import (
+	"context"
+	"errors"
+	"io"
+)
+
+// ErrNotFound is returned when a stored object does not exist.
+var ErrNotFound = errors.New("media: not found")
+
+// Storage is an S3-like object store for attachment bytes.
+type Storage interface {
+	Save(ctx context.Context, key string, r io.Reader) error
+	Open(ctx context.Context, key string) (io.ReadCloser, error)
+	Delete(ctx context.Context, key string) error
+}