Custom Authentication Azure Mobile Services by Api - authentication

Question

I am creating a custom authentication via API on Azure Mobile Service, and picked based on this answer:
Registering and login users in Azure Mobile Services
Then joined with the code of the previous link to create the authentication token.
But I get "internal server error" when I invoke the API. The error happens in here: "...results.length..."
var crypto = require('crypto');
var iterations = 1000;
var bytes = 32;
var aud = "Custom";
var masterKey = "wkeHEoWUaPJSHsSOcWgmVLOZbIpeeg92";
var _request;
var _response;
exports.post = function(request, response) {
var user = request.body.userName;
var pass = request.body.password;
_request = request;
_response = response
validateUserNamePassword(user, pass, function(error, userId, token) {
if (error) {
response.send(401, { error: "Unauthorized" });
} else {
response.send(200, { user: userId, token: token });
}
});
}
function validateUserNamePassword(user, pass, funcao){
var accounts = _request.service.tables.getTable('account');
accounts
.where({ userid : user })
.read({
success: function(results)
{
if (results.length === 0)
{
_response.send(401, { error: "Unauthorized1" });
console.log("Incorrect username or password");
_request.respond(401, "Incorrect username or password");
}
else
_response.send(401, { error: "Unauthorized2" });
var account = results[0];
hash(item.password, account.salt, function(err, h) {
var incoming = h;
if (slowEquals(incoming, account.password)) {
var expiry = new Date().setUTCDate(new Date().getUTCDate() + 30);
var userId = aud + ":" + account.id;
_request.respond(200, {
userId: userId,
token: zumoJwt(expiry, aud, userId, masterKey)
});
}
else {
_request.respond(401, "Incorrect username or password");
}
});
}
}
});
}
function hash(text, salt, callback) {
crypto.pbkdf2(text, salt, iterations, bytes, function(err, derivedKey){
if (err) { callback(err); }
else {
var h = new Buffer(derivedKey).toString('base64');
callback(null, h);
}
});
}
function slowEquals(a, b) {
var diff = a.length ^ b.length;
for (var i = 0; i < a.length && i < b.length; i++) {
diff |= (a[i] ^ b[i]);
}
return diff === 0;
}
function zumoJwt(expiryDate, aud, userId, masterKey) {
var crypto = require('crypto');
function base64(input) {
return new Buffer(input, 'utf8').toString('base64');
}
function urlFriendly(b64) {
return b64.replace(/\+/g, '-').replace(/\//g, '_').replace(new RegExp("=", "g"), '');
}
function signature(input) {
var key = crypto.createHash('sha256').update(masterKey + "JWTSig").digest('binary');
var str = crypto.createHmac('sha256', key).update(input).digest('base64');
return urlFriendly(str);
}
var s1 = '{"alg":"HS256","typ":"JWT","kid":0}';
var j2 = {
"exp":expiryDate.valueOf() / 1000,
"iss":"urn:microsoft:windows-azure:zumo",
"ver":1,
"aud":aud,
"uid":userId
};
var s2 = JSON.stringify(j2);
var b1 = urlFriendly(base64(s1));
var b2 = urlFriendly(base64(s2));
var b3 = signature(b1 + "." + b2);
return [b1,b2,b3].join(".");
}
I'm invoking like this:
try
{
var loginInput = new JObject();
loginInput.Add("userName", "breno");
loginInput.Add("password", "test");
var loginResult = await LoginAuthenticationService.InvokeApiAsync("login", loginInput);
LoginAuthenticationService.CurrentUser = new MobileServiceUser((string)loginResult["user"]);
LoginAuthenticationService.CurrentUser.MobileServiceAuthenticationToken = (string)loginResult["token"];
}
catch (MobileServiceInvalidOperationException e)
{
var exception = e;
}

Answer 1

If you're getting this error "Failed to load script file 'login.js': SyntaxError: Unexpected token }" as seen in the comments, there is a syntax issue with your script. You'll need to go through your scripts and figure out where the issue is at.