Custom cap trimmed options page

<?php
/*
Plugin Name: Editor Options
*/
/*
Copyright (C) 2010 - t31os (not that i really care anyway)

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/
if( !class_exists( 'editor_options' ) ) {

    class editor_options {

        // Constructor
        function editor_options() {
            if( is_admin() )
                add_action( 'admin_menu' , array( &$this , 'register_plugin_pages' ) );
        }

        // Register the plugin pages
        function register_plugin_pages() {

            // Parent menu, options general
            add_menu_page(
                'General Settings',                    // Page title - What you see in the browser title
                'Settings',                            // Menu title - What the menu item is named
                'update_options_general',              // Capability - Capability required to manage this plugin
                'editor_options_general',              // Admin Page - The page name used to query for the plugin
                array( &$this , 'do_options' )         // Callback   - The function to be called when the plugin page is requested
            );
            // Add options general as a submenu so the menu title can differ from the menu heading (above)
            add_submenu_page(
                'editor_options_general',              // Parent menu (self)
                'General Settings',                    // Page title - What you see in the browser title
                'General',                             // Menu title - What the menu item is named
                'update_options_general',              // Capability - Capability required to manage this plugin
                'editor_options_general',              // Admin Page - The page name used to query for the plugin
                array( &$this , 'do_options' )         // Callback   - The function to be called when the plugin page is requested
            );
            // Add the privacy submenu
            add_submenu_page(
                'editor_options_general',              // Parent menu
                'Privacy Settings',                    // Page title - What you see in the browser title
                'Privacy',                             // Menu title - What the menu item is named
                'update_options_privacy',              // Capability - Capability required to manage this plugin
                'editor_options_privacy',              // Admin Page - The page name used to query for the plugin
                array( &$this , 'do_options' )         // Callback   - The function to be called when the plugin page is requested
            );

        }

        // Print out the plugin page
        function do_options() {

            // There should always be a request page, it's part of the URL for the pages
            if( !isset( $_REQUEST['page'] ) )
                wp_die('The plugin page was not requested');

            // Now we know it's set, store
            $requested_page = $_REQUEST['page'];

            // Make sure user has the privs
            if( 'editor_options_privacy' == $requested_page ) {
                if( !current_user_can( 'update_options_privacy' ) )
                    wp_die('Cheatin Huh!');
                $plugin_page = 'Privacy';
            }
            // Make sure user has the privs
            elseif( 'editor_options_general' == $requested_page ) {
                if( !current_user_can( 'update_options_general' ) )
                    wp_die('Cheatin Huh!');
                $plugin_page = 'General';
            }
            else {
                // Else something went wrong, bail out.
                wp_die('Are you sure you requested the right page?');
            }
            // Build valid options array
            $valid_options = array('Submit');

            // If changes were submitted
            if( $_POST ) {
                // Add general options
                if( 'General' == $plugin_page ) {
                    $valid_options[] = 'blogname';
                    $valid_options[] = 'blogdescription';
                }
                // Add privacy option
                elseif( 'Privacy' == $plugin_page ) {
                    $valid_options[] = 'blog_public';
                }
                // If anything else was submitted along with the data, well it's not suppose to be there, so again just bail out..
                foreach( $_POST as $name => $data ) {
                    if( !in_array( $name, $valid_options ) ) {
                        wp_die('Invalid option found on submission, settings could not be saved.');
                    }
                }
                // If we've made this far, we should have options to save (and only valid ones)
                $options = array();
                // Check which page was requested again
                if( 'General' == $plugin_page ) {
                    // General options, let's escape any HTML
                    $options = array_map('esc_html', $_POST );
                }
                elseif( 'Privacy' == $plugin_page ) {
                    // Privacy page, on / off setting, so only need a 0 vs 1 comparision check
                    if( isset( $_POST['blog_public'] ) ) {
                        if( 1 == $_POST['blog_public'] )
                            $options['blog_public'] = '1';
                        else
                            $options['blog_public'] = '0';
                    }
                }
                if( !empty( $options ) ) {
                    unset($_POST['submit']); // Let's not save the submit buttons value
                    foreach( $options as $option_name => $option_value ) {
                        update_option($option_name,$option_value);
                    }
                }
            }
            ?>

            <div class="wrap">
                <?php screen_icon('options-general'); ?>
                <h2><?php echo $plugin_page; ?> Settings</h2>

                <form method="post" action="admin.php?page=<?php echo $requested_page; ?>">

                    <table class="form-table">
                        <?php
                        switch( $plugin_page ) {
                            case 'General':
                        ?>

                        <tr valign="top">
                            <th scope="row"><label for="blogname"><?php _e('Site Title') ?></label></th>
                            <td><input name="blogname" type="text" id="blogname" value="<?php form_option('blogname'); ?>" class="regular-text" /></td>
                            </tr>
                            <tr valign="top">
                            <th scope="row"><label for="blogdescription"><?php _e('Tagline') ?></label></th>
                            <td><input name="blogdescription" type="text" id="blogdescription"  value="<?php form_option('blogdescription'); ?>" class="regular-text" />
                            <span class="description"><?php _e('In a few words, explain what this site is about.') ?></span></td>
                        </tr>

                        <?php
                            break;
                            case 'Privacy':
                        ?>
                        <tr valign="top">
                            <th scope="row"><?php _e('Site Visibility') ?> </th>
                            <td><fieldset><legend class="screen-reader-text"><span><?php _e('Site Visibility') ?> </span></legend>
                            <input id="blog-public" type="radio" name="blog_public" value="1" <?php checked('1', get_option('blog_public')); ?> />
                            <label for="blog-public"><?php _e('I would like my site to be visible to everyone, including search engines (like Google, Bing, Technorati) and archivers');?></label><br/>
                            <input id="blog-norobots" type="radio" name="blog_public" value="0" <?php checked('0', get_option('blog_public')); ?> />
                            <label for="blog-norobots"><?php _e('I would like to block search engines, but allow normal visitors'); ?></label>
                            <?php do_action('blog_privacy_selector'); ?>
                            </fieldset></td>
                        </tr>
                        <?php
                            break;
                        }
                        ?>
                    </table>

                    <p class="submit">
                        <input type="submit" name="Submit" class="button-secondary action" value="Save" />
                    </p>
                </form>
            </div>

            <?php
        }

    }

    // Instantiate the class
    $editor_options = new editor_options();

}
// End class exists statement