add continue-key-transfer api

src/mrmsg.c

@@ -653,6 +653,29 @@ int mrmsg_is_systemcmd(mrmsg_t* msg)
 }
 
 
+/**
+ * Check if the message is an Autocrypt Setup Message.
+ *
+ * Setup messages should be shown in an unique way eg. using a different text color.
+ * On a click or another action, the user should be prompted for the setup code
+ * which is forwarded to mrmailbox_continue_key_transfer() then.
+ *
+ * Setup message are typically generated by mrmailbox_initiate_key_transfer() on another device.
+ *
+ * @memberof mrmsg_t
+ *
+ * @param msg The message object.
+ *
+ * @return 1=message is a setup message, 0=no setup message.
+ *     For setup messages, mrmsg_is_systemcmd() returns 1 and
+ *     mrmsg_get_type() returns MR_MSG_FILE.
+ */
+int mrmsg_is_setupmessage(mrmsg_t* msg)
+{
+	return mrparam_get_int(msg->m_param, MRP_SYSTEM_CMD, 0)==MR_SYSTEM_AUTOCRYPT_SETUP_MESSAGE? 1 : 0;
+}
+
+
 /*******************************************************************************
  * Misc.
  ******************************************************************************/