Method onExists

app/src/main/java/eu/faircode/email/Core.java:2439–2521

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

    }

    private static void onExists(Context context, JSONArray jargs, EntityAccount account, EntityFolder folder, EntityMessage message, EntityOperation op, IMAPFolder ifolder) throws MessagingException, IOException {
        DB db = DB.getInstance(context);

        boolean retry = jargs.optBoolean(0);

        if (message.uid != null)
            return;

        if (message.msgid == null)
            throw new IllegalArgumentException("exists without msgid");

        // Search for message
        // Alternative, inconsistent for Outlook: X-Microsoft-Original-Message-ID
        Message[] imessages = ifolder.search(account.isOutlook()
                ? new HeaderTerm(MessageHelper.HEADER_CORRELATION_ID, message.msgid)
                : new MessageIDTerm(message.msgid));
        EntityLog.log(context, folder.name + " exists" +
                " retry=" + retry +
                " host=" + account.host +
                " outlook=" + account.isOutlook() +
                " messages=" + (imessages == null ? null : imessages.length));

        if (account.isOutlook() && (imessages == null || imessages.length == 0)) {
            imessages = ifolder.search(
                    new HeaderTerm(MessageHelper.HEADER_MICROSOFT_ORIGINAL_MESSAGE_ID, message.msgid));
            EntityLog.log(context, folder.name + " exists alt" +
                    " retry=" + retry +
                    " host=" + account.host +
                    " outlook=" + account.isOutlook() +
                    " messages=" + (imessages == null ? null : imessages.length));
        }

        // Searching for random header:
        //   iCloud: NO [UNAVAILABLE] Unexpected exception
        //   Seznam: Jakarta Mail Exception: java.io.IOException: Connection dropped by server?

        // Some email servers are slow with adding sent messages
        if (retry)
            Log.w(folder.name + " EXISTS retry" +
                    " found=" + (imessages == null ? null : imessages.length) +
                    " host=" + account.host);
        else if (imessages == null || imessages.length == 0) {
            long next = new Date().getTime() + (account.isOutlook() ? EXISTS_RETRY_DELAY_OUTLOOK : EXISTS_RETRY_DELAY);

            Intent intent = new Intent(context, ServiceSynchronize.class);
            intent.setAction("exists:" + message.id);
            PendingIntent piExists = PendingIntentCompat.getForegroundService(
                    context, ServiceSynchronize.PI_EXISTS, intent, PendingIntent.FLAG_UPDATE_CURRENT);

            AlarmManager am = Helper.getSystemService(context, AlarmManager.class);
            AlarmManagerCompatEx.setAndAllowWhileIdle(context, am, AlarmManager.RTC_WAKEUP, next, piExists);
            return;
        }

        if (imessages != null && imessages.length == 1) {
            String msgid;
            try {
                MessageHelper helper = new MessageHelper((MimeMessage) imessages[0], context);