added user-agent check for yacy-hop proxy authentication

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@3343 6c8d7289-2bf4-0310-a012-ef5d649a1542

source/de/anomic/http/httpd.java

@@ -350,8 +350,7 @@ public final class httpd implements serverHandler {
         if (!test.equals(auth.trim().substring(6))) return false;
         
         // the accessing client must use a yacy user-agent
-        
-        return true;
+        return (((String) header.get(httpHeader.USER_AGENT,"")).startsWith("yacy"));
     }
 
     private boolean handleProxyAuthentication(httpHeader header) throws IOException {