Hello,

I'm working on enabling push notifications on my cordova application using the Kinvey javascript SDK.
I'm creating Kinvey users on the first login to the application using Kinvey.User.signup and only giving a username, so the password is generated by the library.
My idea was to store the generated password in my database and check if it exists to determine whether I want to login an existing user or create a new user.
I tried this, but it seems that I'm unable to log in users using the stored password. I get an InvalidCredentialsError.

Am I doing something wrong or am I not supposed to use the generated passwords for future authentication? I could always just generate the password myself and pass it along the username during the signup. This just seems a bit silly, so I'm wondering if there's a cleaner solution.

Thoughts and comments appreciated, thanks!

- Tim

Hi Martin,

Thank you for letting me know it is supposed to work, I will keep trying.
My logic for signup and logging in is roughly as follows: 

if (!kinveyPasswordFromDB) {
	// signup
	var promise = Kinvey.User.signup({
		username: usernameFromDB
	})
	.then(function(user) {
		storeKinveyPassword(user.data.password);
		registerDeviceToKinvey();
	})
	.catch(function(error) {
		console.log(error);
	});
} else {
	// login
	var promise = Kinvey.User.login({
		username: usernameFromDB,
		password: kinveyPasswordFromDB
	})
	.then(function(user) {
		registerDeviceToKinvey();
	})
	.catch(function(error) {
		console.log(error);
	});
}

The way I am testing this right now is logging into my app with a fresh user.  A kinvey user is created using Kinvey's signup function, which generates a password that I save into my database. I then log out the user from the app, which includes calling Kinvey's logout function. I then log in again with this user, and since I have a password stored for this user in my database, I can determine that a Kinvey user already exists and so I attempt to log in using the stored username + password combination, but I get a 401 error 

about invalid credentials.

Okay I tried using the signup with a hardcoded password and it still doesn't allow me to sign the user in after logging out.

So we can rule out the problem being with the generated password. My whole logic is roughly as follows:

initializeKinvey() {
	var passwordFromDB = getPassword();
	var usernameFromDB = getUsername();
	Kinvey.init(settings);
	var promise = Kinvey.ping()
	.then(function (response) {
		console.log('Kinvey Ping Success. Kinvey Service is alive, version: ' + response.version + ', response: ' + response.kinvey);
		signupOrLogin(usernameFromDB, passwordFromDB);
	})
	.catch(function (error) {
		console.log(error);
	});
}

signupOrLogin(usernameFromDB, passwordFromDB) {
	if (!passwordFromDB) {
		// signup
		var promise = Kinvey.User.signup({
			//password: '123',
			username: usernameFromDB
		})
		.then(function(user) {
			storeKinveyPassword(user.data.password);
			registerDeviceToKinvey();
		})
		.catch(function(error) {
			console.log(error);
		});
	} else {
		// login
		var promise = Kinvey.User.login({
			username: usernameFromDB,
			password: passwordFromDB
		})
		.then(function(user) {
			registerDeviceToKinvey();
		})
		.catch(function(error) {
			console.log(error);
		});
	}
}

Reading through the docs, could it have something to do with the logout invalidating the user's auth token?

"Logout destroys the session’s associated auth token, such that subsequent attempts to re-use that token will yield a 401 Unauthorized (error) response."

I managed to solve this by converting my username to a string instead of an integer before signing up. Looking at the Kinvey SDK source, it looks like you are converting usernames to string in the login function, but not doing so in the signup function: https://github.com/Kinvey/js-sdk/blob/master/src/core/user/user.js#L185

If I am not mistaken this would allow me to sign up a user with the username: 123, but when I try to login my username would be converted to "123" by the SDK. This would explain my issues logging in.

- Tim