Spring Security如何优雅的增加OAuth2协议授权模式

public class MobileAuthenticationToken extends AbstractAuthenticationToken {
	private static final long serialVersionUID = SpringSecurityCoreVersion.SERIAL_VERSION_UID;

	private final Object principal;
	private Object credentials;

	public MobileAuthenticationToken(String mobile, String password) {
		super(null);
		this.principal = mobile;
		this.credentials = password;
		setAuthenticated(false);
	}

	public MobileAuthenticationToken(Object principal, Object credentials,
									 Collection<? extends GrantedAuthority> authorities) {
		super(authorities);
		this.principal = principal;
		this.credentials = credentials;
		super.setAuthenticated(true);
	}

	@Override
	public Object getCredentials() {
		return this.credentials;
	}

	@Override
	public Object getPrincipal() {
		return this.principal;
	}

	@Override
	public void setAuthenticated(boolean isAuthenticated) {
		if (isAuthenticated) {
			throw new IllegalArgumentException(
					"Cannot set this token to trusted - use constructor which takes a GrantedAuthority list instead");
		}
		super.setAuthenticated(false);
	}

	@Override
	public void eraseCredentials() {
		super.eraseCredentials();
	}
}

@Setter
public class MobileAuthenticationProvider implements AuthenticationProvider {
  private ZltUserDetailsService userDetailsService;
  private PasswordEncoder passwordEncoder;

  @Override
  public Authentication authenticate(Authentication authentication) {
    MobileAuthenticationToken authenticationToken = (MobileAuthenticationToken) authentication;
    String mobile = (String) authenticationToken.getPrincipal();
    String password = (String) authenticationToken.getCredentials();
    UserDetails user = userDetailsService.loadUserByMobile(mobile);
    if (user == null) {
      throw new InternalAuthenticationServiceException("手机号或密码错误");
    }
    if (!passwordEncoder.matches(password, user.getPassword())) {
      throw new BadCredentialsException("手机号或密码错误");
    }
    MobileAuthenticationToken authenticationResult = new MobileAuthenticationToken(user, password, user.getAuthorities());
    authenticationResult.setDetails(authenticationToken.getDetails());
    return authenticationResult;
  }

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

public class MobilePwdGranter extends AbstractTokenGranter {
  private static final String GRANT_TYPE = "mobile_password";

  private final AuthenticationManager authenticationManager;

  public MobilePwdGranter(AuthenticationManager authenticationManager, AuthorizationServerTokenServices tokenServices
      , ClientDetailsService clientDetailsService, OAuth2RequestFactory requestFactory) {
    super(tokenServices, clientDetailsService, requestFactory, GRANT_TYPE);
    this.authenticationManager = authenticationManager;
  }

  @Override
  protected OAuth2Authentication getOAuth2Authentication(ClientDetails client, TokenRequest tokenRequest) {
    Map<String, String> parameters = new LinkedHashMap<>(tokenRequest.getRequestParameters());
    String mobile = parameters.get("mobile");
    String password = parameters.get("password");
    parameters.remove("password");

    Authentication userAuth = new MobileAuthenticationToken(mobile, password);
    ((AbstractAuthenticationToken) userAuth).setDetails(parameters);
    userAuth = authenticationManager.authenticate(userAuth);
    if (userAuth == null || !userAuth.isAuthenticated()) {
      throw new InvalidGrantException("Could not authenticate mobile: " + mobile);
    }

    OAuth2Request storedOAuth2Request = getRequestFactory().createOAuth2Request(client, tokenRequest);
    return new OAuth2Authentication(storedOAuth2Request, userAuth);
  }
}

// 添加手机号加密码授权模式
tokenGranters.add(new MobilePwdGranter(authenticationManager, tokenServices, clientDetailsService, requestFactory));