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VistADemo.js
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VistADemo.js
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var nodeVista = require('nodeVista');
var crypto = require('crypto');
// Crypto functions
var encryptCredentials = function(accessCode, verifyCode, key) {
var text = 'accessCode=' + accessCode + '&verfiyCode=' + verifyCode;
var cipher = crypto.createCipher('aes-256-cbc',key)
var crypted = cipher.update(text,'utf8','hex')
crypted += cipher.final('hex');
return crypted;
};
var decryptCredentials = function(encryptedString, key) {
var decipher = crypto.createDecipher('aes-256-cbc', key);
var dec;
try {
dec = decipher.update(encryptedString,'hex','utf8')
dec += decipher.final('utf8');
var str = dec.split('accessCode=')[1];
var pieces = str.split('&verfiyCode=');
return {
accessCode: pieces[0],
verifyCode: pieces[1]
};
}
catch(err) {
return {
error: 'Invalid credentials value'
}
}
};
// Re-usable core VistA interface functions
var VistALogin = function(accessCode, verifyCode, ewd) {
var authP = new ewd.mumps.GlobalNode('%zewdTemp', [process.pid]);
authP._delete();
authP._setDocument({
inputs:{
password: verifyCode,
username: accessCode
}
});
var result = ewd.mumps.function('login^ZZCPCR00', '');
if (result === '') {
var document = authP._getDocument();
return {
error: false,
outputs: document.outputs
};
}
else{
return {error: result};
}
};
var getPatientsByName = function(prefix, max, ewd) {
var patientIndex = new ewd.mumps.GlobalNode("DPT", ["B"]);
var results = [];
var namesById = {};
var i = 0;
patientIndex._forPrefix(prefix.toUpperCase(), function(name, node) {
node._forEach(function(id) {
i++;
if (i > max) return true;
results.push({
id: id,
text: name
});
namesById[id] = name;
});
if (i > max) return true;
});
return {
results: results,
namesById: namesById
};
};
var getPatientSummaryDetails = function(patientId, ewd) {
var patient= new ewd.mumps.GlobalNode("DPT", [patientId,'0']);
var patientRec0 = patient._value;
var patientObj = patientRec0.split('^');
return {
EIN: patientId,
name: patientObj[0],
sex: patientObj[1],
DOB: nodeVista.convertFtoStringDate(patientObj[2]),
SSN: patientObj[8]
};
};
// REST & Web Server authentication function
var authenticate = function(ewd) {
var statusCode = 401;
var token = ewd.query.token;
if (ewd.query['rest_auth']) token = ewd.query['rest_auth'];
if (!token) {
return errorResponse('Failed authentication (1)', statusCode, ewd);
}
else if (token === '') {
return errorResponse('Failed authentication (2)', statusCode, ewd);
}
else {
var session = ewd.util.getSession(token);
if (session === '') {
return errorResponse('Failed authentication (3)', statusCode, ewd);
}
else {
ewd.util.updateSessionExpiry({
sessid: session.$('ewd_sessid')._value
});
return {
ok: true,
session: session
}
}
}
};
var loginStatus = function(ewd) {
var status = authenticate(ewd);
if (status.error) return status;
var statusCode=401;
if (status.session.$('VistAUser').$('DUZ')._value === '') return errorResponse('Failed authentication (4)', statusCode, ewd);
if (status.session.$('cipherKey')._value !== '') return errorResponse('Failed authentication (5)', statusCode, ewd);
return status;
}
// REST & Web Service error response formatter function
var errorResponse = function(error, statusCode, ewd) {
if (ewd.query['rest_method']) {
return {
"error": {
"text": error,
"statusCode": statusCode
}
};
}
else {
return {error: error};
}
};
module.exports = {
// encryption function for manual testing
encrypt: function(accessCode, verifyCode, key) {
return encryptCredentials(accessCode, verifyCode, key);
},
// Web Service wrappers
initiate: function(ewd) {
var session = ewd.util.createNewSession('VistADemo', 300);
var token = session.$('ewd_token')._value;
var key = ewd.util.createToken();
session.$('cipherKey')._value = key;
return {
Authorization: token,
key: key
};
},
login: function(ewd) {
var status = authenticate(ewd);
if (status.error) {
return status;
}
else {
var session = status.session;
var sessid = session.$('ewd_sessid')._value;
var errorStatusCode = 400;
var key = session.$('cipherKey')._value;
if (key === '') {
ewd.util.deleteSession(sessid);
return errorResponse('No key available', errorStatusCode, ewd);
}
var credentials = decryptCredentials(ewd.query.credentials, key);
if (credentials.error) {
ewd.util.deleteSession(sessid);
return errorResponse(credentials.error, errorStatusCode, ewd);
}
if (!credentials.accessCode || credentials.accessCode === '') {
ewd.util.deleteSession(sessid);
return errorResponse('Missing Access Code', errorStatusCode, ewd);
}
if (!credentials.verifyCode || credentials.verifyCode === '') {
ewd.util.deleteSession(sessid);
return errorResponse('Missing Verify Code', errorStatusCode, ewd);
}
// ****************************
var results = VistALogin(credentials.accessCode, credentials.verifyCode, ewd);
// ****************************
if (results.error) {
ewd.util.deleteSession(sessid);
return errorResponse(results.error, errorStatusCode, ewd);
}
else {
// logged in
session.$('cipherKey')._delete();
//results.outputs.token = session.$('ewd_token')._value;
session.$('VistAUser')._setDocument(results.outputs);
return results.outputs;
}
}
},
getPatientsByNamePrefix: function(ewd) {
var status = loginStatus(ewd);
if (status.error) {
return status;
}
else {
var session = status.session;
var errorStatusCode = 400;
if (!ewd.query.prefix || ewd.query.prefix === '') return errorResponse('You must enter a name prefix', errorStatusCode, ewd);
// ******************************
var results = getPatientsByName(ewd.query.prefix, 1000, ewd)
// ******************************
return results.results;
}
},
getPatientSummary: function(ewd) {
var status = loginStatus(ewd);
if (status.error) {
return status;
}
else {
var errorStatusCode = 400;
if (!ewd.query.id || ewd.query.id === '') return errorResponse('You must enter a patient Id', errorStatusCode, ewd);
// **********************************
var results = getPatientSummaryDetails(ewd.query.id, ewd)
// **********************************
return results;
}
},
// EWD.js Application Handlers/wrappers
onMessage: {
'EWD.form.login': function(params, ewd) {
if (params.username === '') return 'You must enter an Access Code';
if (params.password === '') return 'You must enter a Verify Code';
// Access Code / Verify Code Example: fakedoc1/1Doc!@#$
// **********************************
var results = VistALogin(params.username, params.password, ewd);
// **********************************
if (results.error) {
return results.error;
}
else {
ewd.session.$('username')._value = params.username;
ewd.session.$('userDUZ')._value = results.outputs.DUZ;
ewd.session.$('displayName')._value = results.outputs.displayName;
ewd.sendWebSocketMsg({
type: 'loggedInAs',
message: {
fullName: results.outputs.displayName
}
});
ewd.session.setAuthenticated();
ewd.sendWebSocketMsg({
type: 'loggedIn',
message: {
ok: true,
name: ewd.session.$('displayName')._value
}
});
return '';
}
},
patientQuery: function(params, ewd) {
if (ewd.session.isAuthenticated) {
// ********************************
var results = getPatientsByName(params.prefix, 40, ewd);
// ********************************
ewd.session.$('names')._delete();
ewd.session.$('names')._setDocument(results.namesById);
ewd.sendWebSocketMsg({
type: 'patientMatches',
message: results.results
});
}
},
patientSelected: function(params, ewd) {
if (ewd.session.isAuthenticated) {
// record at back end for future validation of actions
ewd.session.$('patientIdSelected')._value = params.patientId;
// ***********************************
var results = getPatientSummaryDetails(params.patientId, ewd)
// ***********************************
return results;
}
}
}
};