Fix avatar reupload

internal/web/profile.go

@@ -66,10 +66,19 @@ func (s *WebService) HandleProfileEdit(w http.ResponseWriter, r *http.Request) {
 				s.render(w, r, "profile/edit.html", data)
 				return
 			}
-			if err := s.users.CreateAvatar(r.Context(), data.User.Id, bytes); err != nil {
-				data.Error = "Could not save avatar"
-				s.render(w, r, "profile/edit.html", data)
-				return
+			// Check if the user already has an avatar; if so update, otherwise insert.
+			if _, err := s.users.GetAvatar(r.Context(), data.User.Id); err == nil {
+				if err := s.users.UpdateAvatar(r.Context(), data.User.Id, bytes); err != nil {
+					data.Error = "Could not save avatar"
+					s.render(w, r, "profile/edit.html", data)
+					return
+				}
+			} else {
+				if err := s.users.CreateAvatar(r.Context(), data.User.Id, bytes); err != nil {
+					data.Error = "Could not save avatar"
+					s.render(w, r, "profile/edit.html", data)
+					return
+				}
 			}
 		}