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<?php
class serendipity_event_iplogin extends serendipity_event {
    var $title = 'User-login via IP';

    // Introspection of the plugin
    function introspect(&$propbag){
        global $serendipity;

        $propbag->add('name',          'IP Login Mirror');
        $propbag->add('description',   'User-login via IP');
        $propbag->add('stackable',     false);
        $propbag->add('author',        'Garvin Hicking');
        $propbag->add('version',       '0.01');
        $propbag->add('requirements',  array(
            'serendipity' => '0.8',
            'smarty'      => '2.6.7',
            'php'         => '4.1.0'
        ));
        $propbag->add('event_hooks',    array(
            'frontend_configure' => true,
        ));
        $propbag->add('groups', array('BACKEND_USERMANAGEMENT'));
    }

    // Dummy-Output for Plugin Overview
    function generate_content(&$title) {
        $title = $this->title;
    }

    // Hook on events
    function event_hook($event, &$bag, &$eventData, &$addData) {
        global $serendipity;

        $hooks = &$bag->get('event_hooks');
        if (isset($hooks[$event])) {
            switch($event) {
                // Central plugin hook that is executed on each page.
                case 'frontend_configure':

                    if ($_SESSION['serendipityAuthedUser'] == true) {
                        // The current user is already authenticated. Do not do anything to him. Abort.
                        return true;
                    }
                    
                    // If we are here, the current user is not yet authenticated. First try to see if he is inside our user DB.
                    // We user the IP as both username and login.
                    if (serendipity_authenticate_author($_SERVER['REMOTE_ADDR'], $_SERVER['REMOTE_ADDR'], false, true)) {
                        // If the function returns true, we are authenticated. Hooray for Boobies.
                        return true;
                    }
                    
                    // If this method is still not aborted, the user is neither logged in, nor inside our DB. So create him:
                    serendipity_db_query("INSERT INTO {$serendipity['dbPrefix']}authors 
                                                      (realname, 
                                                       username, 
                                                       password, 
                                                       email, 
                                                       mail_comments, 
                                                       mail_trackbacks, 
                                                       userlevel)
                                               VALUES ('Anonymous', 
                                                       '". serendipity_db_escape_string($_SERVER['REMOTE_ADDR']) ."', 
                                                       '". serendipity_db_escape_string(md5($_SERVER['REMOTE_ADDR'])) . "', 
                                                       '', 
                                                       1, 
                                                       1, 
                                                       0)");
                    // Get the last insert ID from the Table, which will be our new authorid:
                    $id = (int)serendipity_db_insert_id('authors', 'authorid');

                    // Now the user was added. But you'll still need to assign him to a usergroup! We do this by IDs. By default installation, group #1 are normal editors.
                    serendipity_db_query("INSERT INTO {$serendipity['dbPrefix']}authorgroups 
                                                      (authorid, groupid) 
                                               VALUES ('$id', 1)");

                    // Now let's authenticate this user:
                    serendipity_authenticate_author($_SERVER['REMOTE_ADDR'], $_SERVER['REMOTE_ADDR'], false, false);
                    
                    return true;
                    break;

                default:
                    return false;
                    break;
            }
        } else {
            return false;
        }
    }
}