/* IMS POX XML versions of this service */
public void doErrorXML(
HttpServletRequest request,
HttpServletResponse response,
IMSPOXRequest pox,
String s,
String message,
Exception e)
throws java.io.IOException {
if (e != null) {
M_log.error(e.getLocalizedMessage(), e);
}
String msg = rb.getString(s) + ": " + message;
M_log.info(msg);
response.setContentType("application/xml");
PrintWriter out = response.getWriter();
String output = null;
if (pox == null) {
output = IMSPOXRequest.getFatalResponse(msg);
} else {
String body = null;
String operation = pox.getOperation();
if (operation != null) {
body = "<" + operation.replace("Request", "Response") + "/>";
}
output = pox.getResponseFailure(msg, null, body);
}
out.println(output);
M_log.debug(output);
}
@SuppressWarnings("unchecked")
protected void doPostXml(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String ipAddress = request.getRemoteAddr();
M_log.debug("LTI POX Service request from IP=" + ipAddress);
String allowOutcomes =
ServerConfigurationService.getString(
SakaiBLTIUtil.BASICLTI_OUTCOMES_ENABLED,
SakaiBLTIUtil.BASICLTI_OUTCOMES_ENABLED_DEFAULT);
if (!"true".equals(allowOutcomes)) allowOutcomes = null;
if (allowOutcomes == null) {
M_log.warn("LTI Services are disabled IP=" + ipAddress);
response.setStatus(HttpServletResponse.SC_FORBIDDEN);
return;
}
IMSPOXRequest pox = new IMSPOXRequest(request);
if (!pox.valid) {
doErrorXML(request, response, pox, "pox.invalid", pox.errorMessage, null);
return;
}
// check lti_message_type
String lti_message_type = pox.getOperation();
String sourcedid = null;
String message_type = null;
if (M_log.isDebugEnabled()) M_log.debug("POST\n" + XMLMap.prettyPrint(pox.postBody));
Map<String, String> bodyMap = pox.getBodyMap();
if (("replaceResultRequest".equals(lti_message_type)
|| "readResultRequest".equals(lti_message_type)
|| "deleteResultRequest".equals(lti_message_type))
&& allowOutcomes != null) {
sourcedid = bodyMap.get("/resultRecord/sourcedGUID/sourcedId");
message_type = "basicoutcome";
} else {
String output = pox.getResponseUnsupported("Not supported " + lti_message_type);
response.setContentType("application/xml");
PrintWriter out = response.getWriter();
out.println(output);
return;
}
// No point continuing without a sourcedid
if (BasicLTIUtil.isBlank(sourcedid)) {
doErrorXML(request, response, pox, "outcomes.missing", "sourcedid", null);
return;
}
// Handle the outcomes here using the new SakaiBLTIUtil code
if (allowOutcomes != null && "basicoutcome".equals(message_type)) {
processOutcomeXml(request, response, lti_message_type, sourcedid, pox);
return;
}
// Truncate this to the maximum length to insure no cruft at the end
if (sourcedid.length() > 2048) sourcedid = sourcedid.substring(0, 2048);
// Attempt to parse the sourcedid, any failure is fatal
String placement_id = null;
String signature = null;
String user_id = null;
try {
int pos = sourcedid.indexOf(":::");
if (pos > 0) {
signature = sourcedid.substring(0, pos);
String dec2 = sourcedid.substring(pos + 3);
pos = dec2.indexOf(":::");
user_id = dec2.substring(0, pos);
placement_id = dec2.substring(pos + 3);
}
} catch (Exception e) {
// Log some detail for ourselves
M_log.warn(
"Unable to decrypt result_sourcedid IP=" + ipAddress + " Error=" + e.getMessage(), e);
signature = null;
placement_id = null;
user_id = null;
}
// Send a more generic message back to the caller
if (placement_id == null || user_id == null) {
doErrorXML(
request, response, pox, "outcomes.sourcedid", "missing user_id or placement_id", null);
return;
}
M_log.debug("signature=" + signature);
M_log.debug("user_id=" + user_id);
M_log.debug("placement_id=" + placement_id);
Properties pitch = SakaiBLTIUtil.getPropertiesFromPlacement(placement_id, ltiService);
if (pitch == null) {
M_log.debug("Error retrieving result_sourcedid information");
doErrorXML(request, response, pox, "outcomes.sourcedid", "sourcedid", null);
return;
}
String siteId = pitch.getProperty(LTIService.LTI_SITE_ID);
Site site = null;
try {
site = SiteService.getSite(siteId);
} catch (Exception e) {
M_log.debug("Error retrieving result_sourcedid site: " + e.getLocalizedMessage(), e);
}
// Send a more generic message back to the caller
if (site == null) {
doErrorXML(request, response, pox, "outcomes.sourcedid", "sourcedid", null);
return;
}
// Check the message signature using OAuth
String oauth_consumer_key = pox.getOAuthConsumerKey();
String oauth_secret = pitch.getProperty(LTIService.LTI_SECRET);
M_log.debug("oauth_secret: " + oauth_secret);
oauth_secret = SakaiBLTIUtil.decryptSecret(oauth_secret);
M_log.debug("oauth_secret (decrypted): " + oauth_secret);
String URL = SakaiBLTIUtil.getOurServletPath(request);
pox.validateRequest(oauth_consumer_key, oauth_secret, request, URL);
if (!pox.valid) {
if (pox.base_string != null) {
M_log.warn(pox.base_string);
}
doErrorXML(request, response, pox, "outcome.no.validate", oauth_consumer_key, null);
return;
}
// Check the signature of the sourcedid to make sure it was not altered
String placement_secret = pitch.getProperty(LTIService.LTI_PLACEMENTSECRET);
// Send a generic message back to the caller
if (placement_secret == null) {
M_log.debug("placement_secret is null");
doErrorXML(request, response, pox, "outcomes.sourcedid", "sourcedid", null);
return;
}
String pre_hash = placement_secret + ":::" + user_id + ":::" + placement_id;
String received_signature = LegacyShaUtil.sha256Hash(pre_hash);
M_log.debug("Received signature=" + signature + " received=" + received_signature);
boolean matched = signature.equals(received_signature);
String old_placement_secret = pitch.getProperty(LTIService.LTI_OLDPLACEMENTSECRET);
if (old_placement_secret != null && !matched) {
pre_hash = placement_secret + ":::" + user_id + ":::" + placement_id;
received_signature = LegacyShaUtil.sha256Hash(pre_hash);
M_log.debug("Received signature II=" + signature + " received=" + received_signature);
matched = signature.equals(received_signature);
}
// Send a message back to the caller
if (!matched) {
doErrorXML(request, response, pox, "outcomes.sourcedid", "sourcedid", null);
return;
}
response.setContentType("application/xml");
PrintWriter writer = response.getWriter();
String desc = "Message received and validated operation=" + pox.getOperation();
String output = pox.getResponseUnsupported(desc);
writer.println(output);
}