Meteor share sessions data between client and server - cookies

Question

I'm building a restricted signup. I want user with a specific code passed in a url to be able to signup and not others. I'm using the accounts package.
I can prevent account creation in the Accounts.onCreateUser method. I'm looking for a way to tell the server if the client had an authorised signup code. With a classic form (email+password) I can just add an extra hidden field. How can I achieve the same result if the user signs up with let's say Facebook?
Since Meteor doesn't use cookies, I can't store this info in a cookie that the server would access. Session variable are not accessible server side. And since I'm not controlling what got send with the account-facebook creation, I can't use a Session variable on the client side that I'd pass along when the user presses sign up.
Any idea"?

Answer 1

Just add the special token to the user object being passed to Accounts.createUser():
var user = {
email: email,
password: password,
profile: {
token: token
}
};
Accounts.createUser(user, function (error, result) {
if (error) {
console.log(error)
}
});
On the server side you can access this in the Accounts.onCreateUser():
Accounts.onCreateUser(function(options, user) {
console.log(options);
console.log(user);
});
I think it's in the options variable that you will find your token, so it would be options.profile.token.

Answer 2

for me, the best option here was passing in custom parameters to loginbuttons.
see the package docs:
https://github.com/ianmartorell/meteor-accounts-ui-bootstrap-3
Where it outlines the below:
accountsUIBootstrap3.setCustomSignupOptions = function() {
return {
mxpDistinctId: Session.get('mxpdid'),
leadSource: Session.get('leadSource')
}
};