}
//~ Methods ========================================================================================================
public DirContextOperations authenticate(Authentication authentication) {
DirContextOperations user = null;
Assert.isInstanceOf(UsernamePasswordAuthenticationToken.class, authentication,
"Can only process UsernamePasswordAuthenticationToken objects");
String username = authentication.getName();
String password = (String)authentication.getCredentials();
if (!StringUtils.hasLength(password)) {
logger.debug("Rejecting empty password for user " + username);
throw new BadCredentialsException(messages.getMessage("BindAuthenticator.emptyPassword",
"Empty Password"));
}
// If DN patterns are configured, try authenticating with them directly
for (String dn : getUserDns(username)) {
user = bindWithDn(dn, username, password);
if (user != null) {
break;
}
}
// Otherwise use the configured search object to find the user and authenticate with the returned DN.
if (user == null && getUserSearch() != null) {
DirContextOperations userFromSearch = getUserSearch().searchForUser(username);
user = bindWithDn(userFromSearch.getDn().toString(), username, password);
}
if (user == null) {
throw new BadCredentialsException(
messages.getMessage("BindAuthenticator.badCredentials", "Bad credentials"));