@GET
	@Path("/{token}")
	@Produces(MediaType.APPLICATION_JSON)
	public Response whoiam(@PathParam("token") String token)
	{
		Claims claims = null;
		try{
			//This line will throw an exception if it is not a signed JWS (as expected)
		    claims = Jwts.parser()
		       .setSigningKey(DatatypeConverter.parseBase64Binary(key))
		       .parseClaimsJws(token).getBody();
		    return Response.status(200).entity(claims.getId()).build();
		}
		catch(Exception e){
			return null;
		}
	}