accounts_ui.js

if (!Accounts.ui)
    Accounts.ui = {};

if (!Accounts.ui._options) {
    Accounts.ui._options = {
        requestPermissions: {},
        extraSignupFields: []
    };
}


Accounts.ui.config = function(options) {
    // validate options keys
    var VALID_KEYS = ['passwordSignupFields', 'requestPermissions', 'extraSignupFields'];
    _.each(_.keys(options), function(key) {
        if (!_.contains(VALID_KEYS, key))
            throw new Error("Accounts.ui.config: Invalid key: " + key);
    });

    // deal with `passwordSignupFields`
    if (options.passwordSignupFields) {
        if (_.contains([
            "USERNAME_AND_EMAIL_CONFIRM",
            "USERNAME_AND_EMAIL",
            "USERNAME_AND_OPTIONAL_EMAIL",
            "USERNAME_ONLY",
            "EMAIL_ONLY"
        ], options.passwordSignupFields)) {
            if (Accounts.ui._options.passwordSignupFields)
                throw new Error("Accounts.ui.config: Can't set `passwordSignupFields` more than once");
            else
                Accounts.ui._options.passwordSignupFields = options.passwordSignupFields;
        } else {
            throw new Error("Accounts.ui.config: Invalid option for `passwordSignupFields`: " + options.passwordSignupFields);
        }
    }

    // deal with `requestPermissions`
    if (options.requestPermissions) {
        _.each(options.requestPermissions, function(scope, service) {
            if (Accounts.ui._options.requestPermissions[service]) {
                throw new Error("Accounts.ui.config: Can't set `requestPermissions` more than once for " + service);
            } else if (!(scope instanceof Array)) {
                throw new Error("Accounts.ui.config: Value for `requestPermissions` must be an array");
            } else {
                Accounts.ui._options.requestPermissions[service] = scope;
            }
        });
        if (typeof options.extraSignupFields !== 'object' || !options.extraSignupFields instanceof Array) {
            throw new Error("Accounts.ui.config: `extraSignupFields` must be an array.");
        } else {
            if (options.extraSignupFields) {
                _.each(options.extraSignupFields, function(field, index) {
                    if (!field.fieldName || !field.fieldLabel)
                        throw new Error("Accounts.ui.config: `extraSignupFields` objects must have `fieldName` and `fieldLabel` attributes.");
                    if (typeof field.visible === 'undefined')
                        field.visible = true;
                    Accounts.ui._options.extraSignupFields[index] = field;
                });
            }
        }
    }
};

Accounts.ui._passwordSignupFields = function() {
    return Accounts.ui._options.passwordSignupFields || "EMAIL_ONLY";
};