<%@ page import="java.security.InvalidKeyException" %> <%@ page import="java.security.NoSuchAlgorithmException" %> <%@ page import="java.security.SecureRandom" %> <%@ page import="java.util.HashMap" %> <%@ page import="java.util.Map" %> <%@ page import="java.util.Iterator" %> <%@ page import="java.util.TreeSet" %> <%@ page import="javax.crypto.Mac" %> <%@ page import="javax.crypto.SecretKey" %> <%! public static final String DOMAIN_KEY = "{{ item.stdout }}"; public static String generateRedirect(HttpServletRequest request, String name) { HashMap params = new HashMap(); String ts = System.currentTimeMillis()+""; params.put("account", name); params.put("by", "name"); // needs to be part of hmac params.put("timestamp", ts); params.put("expires", "0"); // means use the default String preAuth = computePreAuth(params, DOMAIN_KEY); return request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+"/service/preauth/?" + "account="+name+ "&by=name"+ "×tamp="+ts+ "&expires=0"+ "&preauth="+preAuth; } public static String computePreAuth(Map params, String key) { TreeSet names = new TreeSet(params.keySet()); StringBuffer sb = new StringBuffer(); for (Iterator it=names.iterator(); it.hasNext();) { if (sb.length() > 0) sb.append('|'); sb.append(params.get(it.next())); } return getHmac(sb.toString(), key.getBytes()); } private static String getHmac(String data, byte[] key) { try { ByteKey bk = new ByteKey(key); Mac mac = Mac.getInstance("HmacSHA1"); mac.init(bk); return toHex(mac.doFinal(data.getBytes())); } catch (NoSuchAlgorithmException e) { throw new RuntimeException("fatal error", e); } catch (InvalidKeyException e) { throw new RuntimeException("fatal error", e); } } static class ByteKey implements SecretKey { private byte[] mKey; ByteKey(byte[] key) { mKey = (byte[]) key.clone();; } public byte[] getEncoded() { return mKey; } public String getAlgorithm() { return "HmacSHA1"; } public String getFormat() { return "RAW"; } } public static String toHex(byte[] data) { StringBuilder sb = new StringBuilder(data.length * 2); for (int i=0; i>> 4]); sb.append(hex[data[i] & 0x0f] ); } return sb.toString(); } private static final char[] hex = {'0' , '1' , '2' , '3' , '4' , '5' , '6' , '7' , '8' , '9' , 'a' , 'b' , 'c' , 'd' , 'e' , 'f'}; %><% String casUser = request.getRemoteUser().toString().trim(); String redirect = generateRedirect(request, casUser+"@{{ item.item }}"); response.sendRedirect(redirect); %> You should never see this page!