}
public OAuth2Authentication loadAuthentication(String accessTokenValue) throws AuthenticationException, InvalidTokenException {
OAuth2AccessToken accessToken = tokenStore.readAccessToken(accessTokenValue);
if (accessToken == null) {
throw new InvalidTokenException("Invalid access token: " + accessTokenValue);
}
else if (accessToken.isExpired()) {
tokenStore.removeAccessToken(accessToken);
throw new InvalidTokenException("Access token expired: " + accessTokenValue);
}
OAuth2Authentication result = tokenStore.readAuthentication(accessToken);
if (clientDetailsService != null) {
String clientId = result.getOAuth2Request().getClientId();
try {
clientDetailsService.loadClientByClientId(clientId);
}
catch (ClientRegistrationException e) {
throw new InvalidTokenException("Client not valid: " + clientId, e);
}
}
return result;
}