[Feature] Check content for binary stuff before dumping it to Lua

Issue: #4204

src/lua/lua_mimepart.c

@@ -1420,6 +1420,10 @@ lua_mimepart_get_content (lua_State * L)
 	t->len = part->parsed_data.len;
 	t->flags = 0;
 
+	if (lua_is_text_binary(t)) {
+		t->flags |= RSPAMD_TEXT_FLAG_BINARY;
+	}
+
 	return 1;
 }
 

src/lua/lua_task.c

@@ -2662,6 +2662,10 @@ lua_task_get_content (lua_State * L)
 		t->len = task->msg.len;
 		t->start = task->msg.begin;
 		t->flags = 0;
+
+		if (lua_is_text_binary(t)) {
+			t->flags |= RSPAMD_TEXT_FLAG_BINARY;
+		}
 	}
 	else {
 		return luaL_error (L, "invalid arguments");