Method onAttachment

app/src/main/java/eu/faircode/email/Core.java:2232–2265

(Context context, JSONArray jargs, EntityFolder folder, EntityMessage message, EntityOperation op, IMAPFolder ifolder)

    }

    private static void onAttachment(Context context, JSONArray jargs, EntityFolder folder, EntityMessage message, EntityOperation op, IMAPFolder ifolder) throws JSONException, MessagingException, IOException {
        // Download attachment
        DB db = DB.getInstance(context);

        long id = jargs.getLong(0);

        // Get attachment
        EntityAttachment attachment = db.attachment().getAttachment(id);
        if (attachment == null)
            attachment = db.attachment().getAttachment(message.id, (int) id); // legacy
        if (attachment == null)
            throw new IllegalArgumentException("Local attachment not found");
        if (attachment.subsequence != null)
            throw new IllegalArgumentException("Download of sub attachment");
        if (attachment.available)
            return;
        if (message.uid == null)
            throw new IllegalArgumentException("Attachment/message uid missing");

        // Get message
        Message imessage = ifolder.getMessageByUID(message.uid);
        if (imessage == null)
            throw new MessageRemovedException();

        // Get message parts
        MessageHelper helper = new MessageHelper((MimeMessage) imessage, context);
        MessageHelper.MessageParts parts = helper.getMessageParts();

        // Download attachment
        parts.downloadAttachment(context, attachment, folder);

        if (attachment.size != null)
            EntityLog.log(context, "Operation attachment size=" + attachment.size);
    }

    private static void onDetach(Context context, JSONArray jargs, EntityAccount account, EntityFolder folder, EntityMessage message, IMAPStore istore, IMAPFolder ifolder, State state) throws JSONException, MessagingException, IOException {
        DB db = DB.getInstance(context);