Spring OAuth2.0: Getting User Roles based on Client Id

Question

I have multiple clients registered for my oauth2 auth server. lets say user1 have roles such as ROLE_A, ROLE_B for client1, same user has roes such as ROLE_C, ROLE_D for client2. now when the user logins either using client1 or client2 he is able to see all the four roles ie. ROLE_A, ROLE_B, ROLE_C and ROLE_D.

My requirement was when the user1 logins to client1 it should return only the roles ROLE_A and ROLE_B. when he logins using client2 it should return only ROLE_C and ROLE_D

For achieving this, what I planned is within the authenticate function, I need to get the clientId. so using the clientId and the username I can find the corresponding roles allocated to the user from the db (client-user-roles-mapping table). .But the issue is I don't know how to get the clientId within the authenticate function

 @Override
    public Authentication authenticate(final Authentication authentication) throws AuthenticationException {
        String userName = ((String) authentication.getPrincipal()).toLowerCase();
        String password = (String) authentication.getCredentials();
        if (userName != null && authentication.getCredentials() != null) {
                String clientId = // HERE HOW TO GET THE CLIENT ID 
                Set<String> userRoles = authRepository.getUserRoleDetails(userName.toLowerCase(), clientId);
                Collection<SimpleGrantedAuthority> authorities = fillUserAuthorities(userRoles);
                Authentication token =  new UsernamePasswordAuthenticationToken(userName, StringUtils.EMPTY, authorities);
                return token;
            } else {
                throw new BadCredentialsException("Authentication Failed!!!");
            }
         } else {
             throw new BadCredentialsException("Username or Password cannot be empty!!!");
         }         
    }

Can anyone please help me on this

UPDATE 1

CustomAuthenticationProvider.java

@Component
public class CustomAuthenticationProvider implements AuthenticationProvider {

    private final Logger log = LoggerFactory.getLogger(getClass());

    @Autowired
    private LDAPAuthenticationProvider ldapAuthentication;

    @Autowired
    private AuthRepository authRepository;

    public CustomAuthenticationProvider() {
        super();
    }

    @Override
        public Authentication authenticate(final Authentication authentication) throws AuthenticationException {
            String userName = ((String) authentication.getPrincipal()).toLowerCase();
            String password = (String) authentication.getCredentials();
            if (userName != null && authentication.getCredentials() != null) {
                    String clientId = // HERE HOW TO GET THE CLIENT ID 
                    Set<String> userRoles = authRepository.getUserRoleDetails(userName.toLowerCase(), clientId);
                    Collection<SimpleGrantedAuthority> authorities = fillUserAuthorities(userRoles);
                    Authentication token =  new UsernamePasswordAuthenticationToken(userName, StringUtils.EMPTY, authorities);
                    return token;
                } else {
                    throw new BadCredentialsException("Authentication Failed!!!");
                }
             } else {
                 throw new BadCredentialsException("Username or Password cannot be empty!!!");
             }         
    }


    public boolean invokeAuthentication(String username, String password, Boolean isClientValidation) {
        try {
            Map<String, Object> userDetails = ldapAuthentication.authenticateUser(username, password);
            if(Boolean.parseBoolean(userDetails.get("success").toString())) {
                return true;
            }
        } catch (Exception exception) {
            log.error("Exception in invokeAuthentication::: " + exception.getMessage());
        }
        return false;
    }

    @Override
    public boolean supports(Class<? extends Object> authentication) {
        return (UsernamePasswordAuthenticationToken.class.isAssignableFrom(authentication));
    }

    private Collection<SimpleGrantedAuthority> fillUserAuthorities(Set<String> roles) {
        Collection<SimpleGrantedAuthority> authorties = new ArrayList<SimpleGrantedAuthority>();
        for(String role : roles) {
            authorties.add(new SimpleGrantedAuthority(role));
        }
        return authorties;
    }
}

Answer 1

Here is you code after modification

@Override
public Authentication authenticate(final Authentication authentication) throws AuthenticationException {
    String userName = ((String) authentication.getPrincipal()).toLowerCase();
    String password = (String) authentication.getCredentials();
    if (userName != null && authentication.getCredentials() != null) {
            String clientId = getClientId();
            // validate client ID before use
            Set<String> userRoles = authRepository.getUserRoleDetails(userName.toLowerCase(), clientId);
            Collection<SimpleGrantedAuthority> authorities = fillUserAuthorities(userRoles);
            Authentication token =  new UsernamePasswordAuthenticationToken(userName, StringUtils.EMPTY, authorities);
            return token;
        } else {
            throw new BadCredentialsException("Authentication Failed!!!");
        }
     } else {
         throw new BadCredentialsException("Username or Password cannot be empty!!!");
     }         


private  String getClientId(){
    final HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();

    final String authorizationHeaderValue = request.getHeader("Authorization");
    final String base64AuthorizationHeader = Optional.ofNullable(authorizationHeaderValue)
            .map(headerValue->headerValue.substring("Basic ".length())).orElse("");

    if(StringUtils.isNotEmpty(base64AuthorizationHeader)){
        String decodedAuthorizationHeader = new String(Base64.getDecoder().decode(base64AuthorizationHeader), Charset.forName("UTF-8"));
        return decodedAuthorizationHeader.split(":")[0];
    }

    return "";
}

more info about RequestContextHolder