source: plugins/diggbarblocker/trunk/diggbarblocker.plugin.php @ 3966

<?php
/**
 * DiggBar Blocker Plugin
 *
 * Inspired by http://daringfireball.net/2009/04/how_to_block_the_diggbar
 **/

class DiggbarBlocker extends Plugin
{
        /**
         * Add actions to the plugin page for this plugin
         * @param array $actions An array of actions that apply to this plugin
         * @param string $plugin_id The string id of a plugin, generated by the system
         * @return array The array of actions to attach to the specified $plugin_id
         **/
        public function filter_plugin_config( $actions )
        {
                $actions['configure'] = _t( 'Configure' );
                return $actions;
        }

        /**
         * Respond to the user selecting an action on the plugin page
         * @param string $plugin_id The string id of the acted-upon plugin
         * @param string $action The action string supplied via the filter_plugin_config hook
         **/
        public function action_plugin_ui_configure()
        {
                $ui = new FormUI( strtolower( get_class( $this ) ) );
                $reload_fieldset = $ui->append( 'fieldset', 'reload', _t( 'No Message' ) );
                        
                $reload_page = $reload_fieldset->append( 'checkbox', 'reload', 'option:diggbarblocker__reload', 
                        _t( 'Instead of displaying a message, reload the page without the bar' ) );

                $message_fieldset = $ui->append( 'fieldset', 'message_settings', _t( 'Message Settings' ) );
                $message = $message_fieldset->append( 'textarea', 'message', 'option:diggbarblocker__message', 
                        _t( 'If the box above is not checked, display this to Diggbar-using visitors:' ) );
                $message->rows = 2;
                $message->class[] = 'resizable';

                $link = $message_fieldset->append( 'checkbox', 'addlink', 'option:diggbarblocker__addlink',
                        _t( 'Add a link to the target page.' ) );

                $ui->append( 'submit', 'save', _t( 'Save' ) );
                $ui->out();
        }

        /**
         * Set default text & link behavior
         **/
        public function action_plugin_activation( $file )
        {
                if ( Plugins::id_from_file($file) == Plugins::id_from_file(__FILE__) ) {
                        if ( Options::get( 'diggbarblocker__message' ) == null ) {
                                Options::set( 'diggbarblocker__message', _t( 'This site does not support use of the DiggBar.' ) );
                        }
                        if ( Options::get( 'diggbarblocker__add_link' ) == null ) {
                                Options::set( 'diggbarblocker__addlink', 1 ); 
                        }
                }
        }

        /**
         * Return either a message for the Diggbar user, or just reload the page.
         * @return string buffer of either the message displayed, or reload headers.
         **/
        public function filter_final_output( $buffer )
        {
                if ( preg_match( '#http://digg.com/\w{1,8}/*(\?.*)?$#', $_SERVER[ 'HTTP_REFERER' ]) ) {
                        if ( Options::get( 'diggbarblocker__reload' ) ) {
                                $buffer = '<SCRIPT TYPE="text/JavaScript">
        if (window != top) { 
                top.location.replace( self.location.href );
        }
</SCRIPT>';
                        } else
                        {       
                                $buffer = '<p>' . Options::get( 'diggbarblocker__message' ) .'</p>' . 
                                        ( Options::get( 'diggbarblocker__addlink' ) ? 
                                        _t( '<p>Open <a title="Open in a new window" target="_top" href="') . $_SERVER[ 'SCRIPT_URI' ] . '">' .
                                        $_SERVER[ 'SCRIPT_URI' ] . _t('</a> in a new tab or window to view it.</p>') : '');
                        }       
                }
                return $buffer;
        }
}

?>