class views_plugin_argument_validate_user

class views_plugin_argument_validate_user extends views_plugin_argument_validate {
    function option_definition() {
        $options = parent::option_definition();
        $options['type'] = array(
            'default' => 'uid',
        );
        $options['restrict_roles'] = array(
            'default' => FALSE,
        );
        $options['roles'] = array(
            'default' => array(),
        );
        return $options;
    }
    function options_form(&$form, &$form_state) {
        $form['type'] = array(
            '#type' => 'radios',
            '#title' => t('Type of user argument to allow'),
            '#options' => array(
                'uid' => t('Only allow numeric UIDs'),
                'name' => t('Only allow string usernames'),
                'either' => t('Allow both numeric UIDs and string usernames'),
            ),
            '#default_value' => $this->options['type'],
        );
        $form['restrict_roles'] = array(
            '#type' => 'checkbox',
            '#title' => t('Restrict user based on role'),
            '#default_value' => $this->options['restrict_roles'],
        );
        $form['roles'] = array(
            '#type' => 'checkboxes',
            '#prefix' => '<div id="edit-options-argument-validate-user-roles-wrapper">',
            '#suffix' => '</div>',
            '#title' => t('Restrict to the selected roles'),
            '#options' => user_roles(TRUE),
            '#default_value' => $this->options['roles'],
            '#description' => t('If no roles are selected, users from any role will be allowed.'),
            '#process' => array(
                'expand_checkboxes',
                'views_process_dependency',
            ),
            '#dependency' => array(
                'edit-options-argument-validate-user-restrict-roles' => array(
                    1,
                ),
            ),
        );
    }
    function options_submit($form, &$form_state, &$options) {
        // filter trash out of the options so we don't store giant unnecessary arrays
        $options['roles'] = array_filter($options['roles']);
    }
    function convert_options(&$options) {
        if (!isset($options['type']) && isset($this->argument->options['validate_user_argument_type'])) {
            $options['type'] = $this->argument->options['validate_user_argument_type'];
            $options['restrict_roles'] = $this->argument->options['validate_user_restrict_roles'];
            $options['roles'] = $this->argument->options['validate_user_roles'];
        }
    }
    function validate_argument($argument) {
        $type = $this->options['type'];
        // is_numeric() can return false positives, so we ensure it's an integer.
        // However, is_integer() will always fail, since $argument is a string.
        if (is_numeric($argument) && $argument == (int) $argument) {
            if ($type == 'uid' || $type == 'either') {
                if ($argument == $GLOBALS['user']->uid) {
                    // If you assign an object to a variable in PHP, the variable
                    // automatically acts as a reference, not a copy, so we use
                    // drupal_clone() to ensure that we don't actually mess with the
                    // real global $user object.
                    $account = drupal_clone($GLOBALS['user']);
                }
                $where = 'uid = %d';
            }
        }
        else {
            if ($type == 'name' || $type == 'either') {
                if ($argument == $GLOBALS['user']->name) {
                    $account = drupal_clone($GLOBALS['user']);
                }
                $where = "name = '%s'";
            }
        }
        // If we don't have a WHERE clause, the argument is invalid.
        if (empty($where)) {
            return FALSE;
        }
        if (!isset($account)) {
            $query = "SELECT uid, name FROM {users} WHERE {$where}";
            $account = db_fetch_object(db_query($query, $argument));
        }
        if (empty($account)) {
            // User not found.
            return FALSE;
        }
        // See if we're filtering users based on roles.
        if (!empty($this->options['restrict_roles']) && !empty($this->options['roles'])) {
            $roles = $this->options['roles'];
            $account->roles = array();
            $account->roles[] = $account->uid ? DRUPAL_AUTHENTICATED_RID : DRUPAL_ANONYMOUS_RID;
            $result = db_query('SELECT rid FROM {users_roles} WHERE uid = %d', $account->uid);
            while ($role = db_fetch_object($result)) {
                $account->roles[] = $role->rid;
            }
            if (!(bool) array_intersect($account->roles, $roles)) {
                return FALSE;
            }
        }
        $this->argument->argument = $account->uid;
        $this->argument->validated_title = isset($account->name) ? check_plain($account->name) : check_plain(variable_get('anonymous', t('Anonymous')));
        return TRUE;
    }

}