/**
* sends TS Request and receives an answer in following definition
*
* <p>The TimeStampResp ASN.1 type definition:
*
* <pre>
*
* TimeStampResp ::= SEQUENCE {
* status PKIStatusInfo,
* timeStampToken TimeStampToken OPTIONAL ]
*
* PKIStatusInfo ::= SEQUENCE {
* status PKIStatus,
* statusString PKIFreeText OPTIONAL,
* failInfo PKIFailureInfo OPTIONAL }
*
* PKIStatus ::= INTEGER {
* granted (0),
* -- when the PKIStatus contains the value zero a TimeStampToken, as
* -- requested, is present.
* grantedWithMods (1),
* -- when the PKIStatus contains the value one a TimeStampToken,
* -- with modifications, is present.
* rejection (2),
* waiting (3),
* revocationWarning (4),
* -- this message contains a warning that a revocation is
* -- imminent
* revocationNotification (5)
* -- notification that a revocation has occurred }
*
* PKIFreeText ::= SEQUENCE SIZE (1..MAX) OF UTF8String
* -- text encoded as UTF-8 String (note: each UTF8String SHOULD
* -- include an RFC 1766 language tag to indicate the language
* -- of the contained text)
*
* PKIFailureInfo ::= BIT STRING {
* badAlg (0),
* -- unrecognized or unsupported Algorithm Identifier
* badRequest (2),
* -- transaction not permitted or supported
* badDataFormat (5),
* -- the data submitted has the wrong format
* timeNotAvailable (14),
* -- the TSA's time source is not available
* unacceptedPolicy (15),
* -- the requested TSA policy is not supported by the TSA
* unacceptedExtension (16),
* -- the requested extension is not supported by the TSA
* addInfoNotAvailable (17)
* -- the additional information requested could not be understood
* -- or is not available
* systemFailure (25)
* -- the request cannot be handled due to system failure }
*
* TimeStampToken ::= ContentInfo
* -- contentType is id-signedData
* -- content is SignedData
* -- eContentType within SignedData is id-ct-TSTInfo
* -- eContent within SignedData is TSTInfo
*
* </pre>
*
* @param tsq TimeStamp Request to be sent to TSA
* @param server complete URL of the TSA server
* @return TimeStamp Response created from TSA's response
*/
private TimeStampResponse getTSResponse(TimeStampRequest tsq, String server)
throws IOException, TSPException {
logger.trace("entering getTSResponse() method");
logger.entry(tsq, server);
final byte[] request = tsq.getEncoded();
// open valid connection
HttpURLConnection con;
try {
URL url = new URL(server);
con = (HttpURLConnection) url.openConnection();
} catch (IOException e) {
logger.error("TSA server couldn't be contacted");
throw e;
}
con.setDoOutput(true);
con.setDoInput(true);
con.setRequestProperty("Content-type", "application/timestamp-query");
// con.setRequestProperty("Content-length", String.valueOf(request.length));
logger.info("TSA server was successfully contacted");
// send request
OutputStream out;
try {
out = con.getOutputStream();
out.write(request);
out.flush();
} catch (IOException e) {
logger.error("Failed to send the TS request.");
throw e;
}
logger.debug("TS request sent");
// receive response
InputStream in;
TimeStampResp resp;
TimeStampResponse response;
try {
// verify connection status
if (con.getResponseCode() != HttpURLConnection.HTTP_OK) {
throw new IOException(
"Received HTTP error: " + con.getResponseCode() + " - " + con.getResponseMessage());
} else {
logger.debug("Response Code: {}", con.getResponseCode());
}
// accept the answer
in = con.getInputStream();
resp = TimeStampResp.getInstance(new ASN1InputStream(in).readObject());
response = new TimeStampResponse(resp);
// verify the answer
response.validate(tsq);
} catch (TSPException | IOException e) {
logger.error("Cannot interpret incoming data.");
throw e;
}
logger.debug("Status: {}", response.getStatusString()); // null means OK
return logger.exit(response);
}
