Sidebar login

<?php
/*
Plugin Name: Sidebar Login
Description: Adds a sidebar widget to let users login
Author: Mike Jolley, [EMAIL="jolley_small@tesco.net"]jolley_small@tesco.net[/EMAIL]
Version: 1.0
Author URI: [URL="http://blue-anvil.com"]Blue Anvil Journal[/URL]
*/


function widget_sidebarLogin_init() {


    if ( !function_exists('register_sidebar_widget') )
        return;


        function widget_sidebarLogin($args) {
        
            extract($args);
            
            // Get user info
            global $user_level,$user_identity,$user_ID;
            get_currentuserinfo();
            
            if ('' != $user_ID) {
                // User is logged in
                echo $before_widget . $before_title . "Willkommen ".$user_identity . $after_title;
                echo '
                    <ul class="pagenav">
                        <li class="page_item"><a href="'.get_bloginfo('wpurl').'/wp-admin">Site-Admin</a></li>
                        <li class="page_item"><a href="?page_id=53">Interner Bereich</a></li>
                        <li class="page_item"><a href="'.get_bloginfo('wpurl').'/wp-login.php?action=logout&redirect_to=http://'.$_SERVER["SERVER_NAME"].$_SERVER['REQUEST_URI'].'">Logout</a></li>
                    </ul>
                ';
            } else {
            // User is NOT logged in!!!
                    echo $before_widget . $before_title . "Login" . $after_title;
                    // Show any errors
                    //session_start();
                    $errors = array();
                    $errors = unserialize($_SESSION['sidebarLogin_errors']);
                    $_SESSION['sidebarLogin_errors'] = "";


                    if ( !empty( $errors ) ) {
                        if ( is_array( $errors ) ) {
                            $newerrors = "\n";
                            foreach ( $errors as $error ) $newerrors .= '    ' . $error . "<br />\n";
                            $errors = $newerrors;
                        }
                
                        echo '<div class="errors">' .$errors . "</div>\n";
                        echo "<p><strong>Note:</strong> You must <a href='http://www.google.com/cookies.html'>enable cookies</a> to use this site.</p>";
                    }
            
                    // login form
                    echo '<form action="';
                    // Get url for wp_login page
                    echo  get_bloginfo("siteurl")."/wp-login.php";
                    echo  '" method="post" >';
                    ?>
                    
                    <p><label for="user_login"><?php _e('Username:') ?><br/><input name="log" class="mid" id="user_login" type="text" /></label></p>
                    <p><label for="user_pass"><?php _e('Password:') ?><br/><input name="pwd" class="mid" id="user_pass" type="password" /></label></p>
                    <p><label for="rememberme"><input name="rememberme" class="checkbox" id="rememberme" value="forever" type="checkbox" /> <?php _e('Remember me'); ?></label></p>
                    <p class="submit"><input type="submit" name="wp-submit" id="wp-submit" value="<?php _e('Login'); ?> &raquo;" />
                    <input type="hidden" name="redirect_to" value="<?php echo "http://".$_SERVER["SERVER_NAME"].$_SERVER['REQUEST_URI']; ?>" />
                    <input type="hidden" name="sidebarLogin_posted" value="1" /></p>
                    </form>
                    
                    <?php 
                    // Output other links
                    echo '<ul class="sidebarLogin_otherlinks">';
                    if (get_option('users_can_register')) : 
                    ?>
                        <li><a href="<?php bloginfo('wpurl'); ?>/wp-login.php?action=register"><?php _e('Register') ?></a></li>
                        <li><a href="<?php bloginfo('wpurl'); ?>/wp-login.php?action=lostpassword" title="<?php _e('Password Lost and Found') ?>"><?php _e('Lost your password?') ?></a></li>
                    <?php else : ?>
                        <li><a href="<?php bloginfo('wpurl'); ?>/wp-login.php?action=lostpassword" title="<?php _e('Password Lost and Found') ?>"><?php _e('Lost your password?') ?></a></li>
                    <?php endif; ?>
                    
                    </ul>
                    
                    <?php
                    
            }
        
            // echo widget closing tag
            echo $after_widget;
    }


    // Register widget for use
    register_sidebar_widget(array('Sidebar Login', 'widgets'), 'widget_sidebarLogin');


}


function widget_sidebarLogin_geterrrors() {
    global $errors, $error, $wp_locale;
    // GETS ERRORS AND REDIRECTS BACK IF ANY FOUND
    if ($_REQUEST['sidebarLogin_posted']==1) {
        if ( isset( $_REQUEST['redirect_to'] ) )
            $redirect_to = $_REQUEST['redirect_to'];
        // Save error messages for later!
        //session_start();
        // Incase a plugin uses $error rather than the $errors array
        $errors2=array();
        $errors2=$errors;
        if ( !empty( $error ) ) {
            $errors2['error'] = $error;
        }
    
        if ( !empty( $errors2 ) ) {
            if ( is_array( $errors2 ) ) {
                $newerrors = "\n";
                foreach ( $errors2 as $err ) $newerrors .= '    ' . $err . "<br />\n";
                $errors2 = $newerrors;
            }
        }
        $_SESSION['sidebarLogin_errors'] = serialize(apply_filters('login_errors', $errors2));
        // Redirect back
        wp_redirect($redirect_to);
        exit();
        ob_end_flush();
    }
    
}


function widget_sidebarLogin_start() {
    if ($_REQUEST['sidebarLogin_posted']==1) {
        ob_start();
        session_start();
    }
}


function widget_sidebarLogin_hstart() {
        session_start();
}
    
// Run code and init
add_action('widgets_init', 'widget_sidebarLogin_init');
// Add code to save errors to session var
add_action('login_head', 'widget_sidebarLogin_geterrrors');
add_action('wp_authenticate', 'widget_sidebarLogin_start');
add_action('init', 'widget_sidebarLogin_hstart');
?>