Gravity Forms PayPal Add-On - User Update

<?php
/*
Plugin Name: Gravity Forms PayPal Add-On - User Update
Plugin URI: http://pronamic.eu/wp-plugins/gravityformspaypal-userupdate
Description: Makes it easy to update an user role to an value from an Gravity Forms field.
Version: 0.1
Author: pronamic
Author URI: http://pronamic.eu/
*/

class GFPayPalUserUpdate {
    /**
     * Text domain of this plugin
     *
     * @var string
     */
    const TEXT_DOMAIN = 'gravityformspaypal-userupdate';

    //////////////////////////////////////////////////

    /**
     * Bootstrap
     */
    public static function bootstrap() {
        add_action('init', array(__CLASS__, 'initialize'));
        add_action('admin_init',  array(__CLASS__, 'adminInitialize'));
    }

    //////////////////////////////////////////////////

    /**
     * Initialize
     */
    public static function initialize() {
        add_action('gform_paypal_fulfillment', array(__CLASS__, 'updateUserRole'), 10, 2);
    }

    /**
     * Admin initialize
     */
    public static function adminInitialize() {
        add_action('gform_paypal_add_option_group', array(__CLASS__, 'addOptionGroup'), 10, 2);

        add_filter('gform_paypal_save_config', array(__CLASS__, 'saveConfig'));
    }

    //////////////////////////////////////////////////

    /**
     * Update user role
     *
     * @param array $entry
     * @param array $config
     */
    public static function updateUserRole($entry, $config) {
        // Gravity Forms User Registration Add-On
        if(class_exists('GFUserData')) {
            $user = GFUserData::get_user_by_entry_id($entry['id']);
        }

        if($user == false) {
            $user = new WP_User($entry['created_by']);
        }

        $paypalConfig = GFPayPal::get_config($entry['form_id']);

        $userRoleFieldId = $paypalConfig['meta']['user_role_field_id'];

        if($user && !empty($userRoleFieldId) && isset($entry[$userRoleFieldId])) {
            $value = $entry[$userRoleFieldId];
            $value = GFCommon::get_selection_value($value);

            $user->set_role($value);
        }
    }

    /**
     * Save config
     *
     * @param array $config
     */
    public static function saveConfig($config) {
        $config['meta']['user_role_field_id'] = rgpost('gf_paypal_user_role_field_id');

        return $config;
    }

    //////////////////////////////////////////////////

    /**
     * Add option group
     *
     * @param array $config
     * @param array $form
     */
    public static function addOptionGroup($config, $form) {
        $userRoleFieldId = $config['meta']['user_role_field_id'];

        ?>
        <div class="margin_vertical_10" style="<?php echo $display_registration_options; ?>">
            <label for="gf_paypal_user_role_field_id" class="left_header"><?php _e('Update User Role', self::TEXT_DOMAIN); ?></label>

            <select id="gf_paypal_user_role_field_id" name="gf_paypal_user_role_field_id">

            </select>
        </div>

        <script type="text/javascript">
            jQuery(document).ready(function($) {
                function setPayPalUserUpdateField(selectedField) {
                    var fields = "<option></option>" + GetSelectableFields(selectedField, 20);

                    $("#gf_paypal_user_role_field_id").html(fields);
                }

                setPayPalUserUpdateField("<?php echo $userRoleFieldId; ?>");

                $(document).bind("paypalFormSelected", function(form) {
                    setPayPalUserUpdateField("");
                });
            });
        </script>
        <?php
    }
}

GFPayPalUserUpdate::bootstrap();