protected CMSSignedData timestamp()

in jsign-core/src/main/java/net/jsign/timestamp/RFC3161Timestamper.java [48:86]
33 lines of code
4 McCabe index (conditional complexity)

    protected CMSSignedData timestamp(DigestAlgorithm algo, byte[] encryptedDigest) throws IOException, TimestampingException {
        TimeStampRequestGenerator reqgen = new TimeStampRequestGenerator();
        reqgen.setCertReq(true);
        TimeStampRequest req = reqgen.generate(algo.oid, algo.getMessageDigest().digest(encryptedDigest));
        byte[] request = req.getEncoded();

        HttpURLConnection conn = (HttpURLConnection) tsaurl.openConnection();
        conn.setConnectTimeout(10000);
        conn.setReadTimeout(10000);
        conn.setDoOutput(true);
        conn.setDoInput(true);
        conn.setUseCaches(false);
        conn.setRequestMethod("POST");
        conn.setRequestProperty("Content-type", "application/timestamp-query");
        conn.setRequestProperty("Content-length", String.valueOf(request.length));
        conn.setRequestProperty("Accept", "application/timestamp-reply");
        conn.setRequestProperty("User-Agent", "Transport");
        
        conn.getOutputStream().write(request);
        conn.getOutputStream().flush();

        if (conn.getResponseCode() >= 400) {
            throw new IOException("Unable to complete the timestamping due to HTTP error: " + conn.getResponseCode() + " - " + conn.getResponseMessage());
        }

        try {
            TimeStampResp resp = TimeStampResp.getInstance(new ASN1InputStream(conn.getInputStream()).readObject());
            TimeStampResponse response = new TimeStampResponse(resp);
            response.validate(req);
            if (response.getStatus() != 0) {
                throw new IOException("Unable to complete the timestamping due to an invalid response (" + response.getStatusString() + ")");
            }

            return response.getTimeStampToken().toCMSSignedData();

        } catch (Exception e) {
            throw new TimestampingException("Unable to complete the timestamping", e);
        }
    }