public Authentication authenticate(Authentication authentication) throws AuthenticationException {
CasAuthentication casauth = (CasAuthentication) authentication;
// If an existing CasAuthenticationToken, just check we created it
if (casauth.isAuthenticated()) {
if (key.hashCode() == casauth.getKeyHash()) {
return authentication;
} else {
throw new BadCredentialsException("CasAuthenticationProvider.incorrectKey");
}
}
// Ensure credentials are presented
if (Strings.isEmpty(String.valueOf(casauth.getCredentials()))) {
throw new BadCredentialsException("CasAuthenticationProvider.noServiceTicket");
}
boolean stateless = false;
if (STATELESS_ID.equals(casauth.getPrincipal())) {
stateless = true;
}
CasAuthentication result = null;
// Try to obtain from cache
if (stateless) {
result = statelessTicketCache.get(casauth.getCredentials().toString());
}
if (result == null) {
result = authenticateNow(casauth);
result.setDetails(casauth.getDetails());
}
// Add to cache
if (stateless) {
statelessTicketCache.put(result);
}
return result;
}
private CasAuthentication authenticateNow(CasAuthentication auth) throws AuthenticationException {
try {
final Assertion assertion =
ticketValidator.validate(auth.getCredentials().toString(), auth.getLoginUrl());
String name = assertion.getPrincipal();
final UserDetail userDetail = userDetailService.loadDetail(name);
if (null == userDetail) {
logger.error("cannot load {}'s detail from system", name);
throw new UsernameNotFoundException(Strings.concat("user ", name, " not found in system"));
}
userDetailChecker.check(userDetail);
return new CasAuthentication(
key,
userDetail,
auth.getCredentials(),
userDetail.getAuthorities(),
userDetail,
assertion);
} catch (final TicketValidationException e) {
throw new BadCredentialsException("Bad credentials :" + auth.getCredentials().toString(), e);
}
}