Remote subscribe from a GNU Social site is now possible

mod/xrd.php

@@ -54,6 +54,7 @@ function xrd_init(&$a) {
 		'$dspr'        => $dspr,
 		'$salmon'      => $a->get_baseurl() . '/salmon/'        . $r[0]['nickname'],
 		'$salmen'      => $a->get_baseurl() . '/salmon/'        . $r[0]['nickname'] . '/mention',
+		'$subscribe'   => $a->get_baseurl() . '/follow?url={uri}',
 		'$modexp'      => 'data:application/magic-public-key,'  . $salmon_key,
 		'$bigkey'      =>  salmon_key($r[0]['pubkey'])
 	));

view/templates/xrd_person.tpl

@@ -29,6 +29,8 @@
           href="{{$salmon}}" />
     <Link rel="http://salmon-protocol.org/ns/salmon-mention" 
           href="{{$salmen}}" />
+    <Link rel="http://ostatus.org/schema/1.0/subscribe"
+          template="{{$subscribe}}" />
     <Link rel="magic-public-key" 
           href="{{$modexp}}" />