use core functions to detect SSL.patch

Index: domain_mapping.php
===================================================================
--- domain_mapping.php  (revision 464429)
+++ domain_mapping.php  (working copy)
@@ -449,9 +449,7 @@
        return false;
    }

-   if ( false == isset( $_SERVER[ 'HTTPS' ] ) )
-       $_SERVER[ 'HTTPS' ] = 'Off';
-   $protocol = ( 'on' == strtolower( $_SERVER[ 'HTTPS' ] ) ) ? 'https://' : 'http://';
+   $protocol = is_ssl() ? 'https://' : 'http://';
    $domains = $wpdb->get_results( "SELECT * FROM {$wpdb->dmtable} WHERE blog_id = '{$wpdb->blogid}'", ARRAY_A );
    if ( is_array( $domains ) && !empty( $domains ) ) {
        $orig_url = parse_url( get_original_url( 'siteurl' ) );
@@ -542,9 +540,7 @@
        }

        $wpdb->suppress_errors( $s );
-       if ( false == isset( $_SERVER[ 'HTTPS' ] ) )
-           $_SERVER[ 'HTTPS' ] = 'Off';
-       $protocol = ( 'on' == strtolower( $_SERVER[ 'HTTPS' ] ) ) ? 'https://' : 'http://';
+       $protocol = is_ssl() ? 'https://' : 'http://';
        if ( $domain ) {
            $return_url[ $wpdb->blogid ] = untrailingslashit( $protocol . $domain  );
            $setting = $return_url[ $wpdb->blogid ];
@@ -577,7 +573,7 @@
        } else {
            $orig_url = get_blog_option( $blog_id, $url );
        }
-       if ( isset( $_SERVER[ 'HTTPS' ] ) && 'on' == strtolower( $_SERVER[ 'HTTPS' ] ) ) {
+       if ( is_ssl() ) {
            $orig_url = str_replace( "http://", "https://", $orig_url );
        } else {
            $orig_url = str_replace( "https://", "http://", $orig_url );
@@ -690,9 +686,7 @@
 function remote_logout_loader() {
    global $current_site, $current_blog, $wpdb;
    $wpdb->dmtablelogins = $wpdb->base_prefix . 'domain_mapping_logins';
-   if ( false == isset( $_SERVER[ 'HTTPS' ] ) )
-       $_SERVER[ 'HTTPS' ] = 'Off';
-   $protocol = ( 'on' == strtolower( $_SERVER[ 'HTTPS' ] ) ) ? 'https://' : 'http://';
+   $protocol = is_ssl() ? 'https://' : 'http://';
    $hash = get_dm_hash();
    $key = md5( time() );
    $wpdb->query( $wpdb->prepare( "INSERT INTO {$wpdb->dmtablelogins} ( `id`, `user_id`, `blog_id`, `t` ) VALUES( %s, 0, %d, NOW() )", $key, $current_blog->blog_id ) );
@@ -704,9 +698,7 @@

 function redirect_to_mapped_domain() {
    global $current_blog, $wpdb;
-   if ( !isset( $_SERVER[ 'HTTPS' ] ) )
-       $_SERVER[ 'HTTPS' ] = 'off';
-   $protocol = ( 'on' == strtolower($_SERVER['HTTPS']) ) ? 'https://' : 'http://';
+   $protocol = is_ssl() ? 'https://' : 'http://';
    $url = domain_mapping_siteurl( false );
    if ( $url && $url != untrailingslashit( $protocol . $current_blog->domain . $current_blog->path ) ) {
        $redirect = get_site_option( 'dm_301_redirect' ) ? '301' : '302';
@@ -736,9 +728,7 @@

    $wpdb->dmtablelogins = $wpdb->base_prefix . 'domain_mapping_logins';
    $hash = get_dm_hash();
-   if ( false == isset( $_SERVER[ 'HTTPS' ] ) )
-       $_SERVER[ 'HTTPS' ] = 'Off';
-   $protocol = ( 'on' == strtolower( $_SERVER[ 'HTTPS' ] ) ) ? 'https://' : 'http://';
+   $protocol = is_ssl() ? 'https://' : 'http://';
    if ( $_GET[ 'dm' ] == $hash ) {
        if ( $_GET[ 'action' ] == 'load' ) {
            if ( !is_user_logged_in() )
@@ -782,9 +772,7 @@
    if ( 0 == get_site_option( 'dm_remote_login' ) || is_user_logged_in() )
        return false;

-   if ( false == isset( $_SERVER[ 'HTTPS' ] ) )
-       $_SERVER[ 'HTTPS' ] = 'Off';
-   $protocol = ( 'on' == strtolower( $_SERVER[ 'HTTPS' ] ) ) ? 'https://' : 'http://';
+   $protocol = is_ssl() ? 'https://' : 'http://';
    $hash = get_dm_hash();
    echo "<script src='{$protocol}{$current_site->domain}{$current_site->path}?dm={$hash}&amp;action=load&amp;blogid={$current_blog->blog_id}&amp;siteid={$current_blog->site_id}&amp;t=" . mt_rand() . "&amp;back=" . urlencode( $protocol . $current_blog->domain . $_SERVER[ 'REQUEST_URI' ] ) . "' type='text/javascript'></script>";
 }