Spring Security Oauth2 扩展grant_type

   在使用Jhipster 搭建微服务框架时，使用了jhipster 提供的uaa做用户认证授权，Jhipster uaa 是基于spring security oauth2 做授权认证，而spring security oauth2 默认授权模式不满足实际的业务需要，例如手机验证码授权、第三方认证授权等，那么需要自己去扩展授权实现。
   由于初次使用spring security ，上网找了一下方案，看了很多文章基本都差不多（很多解决方案都是相互拷贝的），但实际尝试之后并没有成功，也许是我漏掉了什么配置，也许是贴出的代码不完整，总之没有成功。但是看方案的过程中也get到了很多，最终整理了我的实现方案，如果你也遇到了同样的问题，希望能给你带来帮助或提供一些思路。
   1、新建granter 继承AbstractTokenGranter 可以参考默认实现类ResourceOwnerPasswordTokenGranter

public class SmsCodeTokenGranter extends AbstractTokenGranter {
   // 仅仅复制了 ResourceOwnerPasswordTokenGranter，只是改变了 GRANT_TYPE 的值，来验证自定义授权模式的可行性
   private static final String GRANT_TYPE = "sms_code";

   private final AuthenticationManager authenticationManager;

   public SmsCodeTokenGranter(
       AuthenticationManager authenticationManager,
       AuthorizationServerTokenServices tokenServices,
       ClientDetailsService clientDetailsService,
       OAuth2RequestFactory requestFactory) {
       this(authenticationManager, tokenServices, clientDetailsService, requestFactory, GRANT_TYPE);

   }

   protected SmsCodeTokenGranter(
       AuthenticationManager authenticationManager,
       AuthorizationServerTokenServices tokenServices,
       ClientDetailsService clientDetailsService,
       OAuth2RequestFactory requestFactory,
       String grantType) {
       super(tokenServices, clientDetailsService, requestFactory, grantType);
       this.authenticationManager = authenticationManager;
   }

   @Override

   protected OAuth2Authentication getOAuth2Authentication(ClientDetails client, TokenRequest tokenRequest) {
       Map<String, String> parameters = new LinkedHashMap<String, String>(tokenRequest.getRequestParameters());
       // 获取参数
       String mobile = parameters.get("mobile");
       String smsCode = parameters.get("sms_code");

       // 验证实现
       User user = new User();

       Authentication userAuth = new UsernamePasswordAuthenticationToken("admin", "admin");
       ((AbstractAuthenticationToken) userAuth).setDetails(parameters);
       try {
           userAuth = authenticationManager.authenticate(userAuth);
       } catch (AccountStatusException ase) {
           //covers expired, locked, disabled cases (mentioned in section 5.2, draft 31)
           throw new InvalidGrantException(ase.getMessage());
       } catch (BadCredentialsException e) {
           // If the username/password are wrong the spec says we should send 400/invalid grant
           throw new InvalidGrantException(e.getMessage());
       }
       if (userAuth == null || !userAuth.isAuthenticated()) {
           throw new InvalidGrantException("Could not authenticate user: " + mobile);
       }

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

   2、添加自定义granter

    @Configuration
@EnableAuthorizationServer
public class UaaConfiguration extends AuthorizationServerConfigurerAdapter implements ApplicationContextAware {
	// ... 省略部分代码

	private TokenGranter tokenGranter(final AuthorizationServerEndpointsConfigurer endpoints) {
        List<TokenGranter> granters = new ArrayList<TokenGranter>(Arrays.asList(endpoints.getTokenGranter()));// 获取默认的granter集合
        granters.add(new SmsCodeTokenGranter(authenticationManager,endpoints.getTokenServices(), endpoints.getClientDetailsService(), endpoints.getOAuth2RequestFactory()));
        return new CompositeTokenGranter(granters);
    }
}

   3、配置client的grant_type

public class UaaConfiguration extends AuthorizationServerConfigurerAdapter implements ApplicationContextAware {
	// ... 省略部分代码

	@Override
    public void configure(AuthorizationServerEndpointsConfigurer endpoints) throws Exception {
        //pick up all  TokenEnhancers incl. those defined in the application
        //this avoids changes to this class if an application wants to add its own to the chain
        Collection<TokenEnhancer> tokenEnhancers = applicationContext.getBeansOfType(TokenEnhancer.class).values();
        TokenEnhancerChain tokenEnhancerChain = new TokenEnhancerChain();
        tokenEnhancerChain.setTokenEnhancers(new ArrayList<>(tokenEnhancers));
        endpoints
            .authenticationManager(authenticationManager)
            .tokenGranter(tokenGranter(endpoints)) // 配置granter 为最新的
            .tokenStore(tokenStore())
            .tokenEnhancer(tokenEnhancerChain)
            .reuseRefreshTokens(false);             //don't reuse or we will run into session inactivity timeouts
    }
}

简单的三步，扩展完毕，可以自己修改请求的grant_type来验证了 。