摘要：前言基于做微服務架構分布式系統(tǒng)時，作為認證的業(yè)內標準，也提供了全套的解決方案來支持在環(huán)境下使用，提供了開箱即用的組件。

基于SpringCloud做微服務架構分布式系統(tǒng)時，OAuth2.0作為認證的業(yè)內標準，Spring Security OAuth2也提供了全套的解決方案來支持在Spring Cloud/Spring Boot環(huán)境下使用OAuth2.0，提供了開箱即用的組件。但是在開發(fā)過程中我們會發(fā)現(xiàn)由于Spring Security OAuth2的組件特別全面，這樣就導致了擴展很不方便或者說是不太容易直指定擴展的方案，例如：

圖片驗證碼登錄

短信驗證碼登錄

微信小程序登錄

第三方系統(tǒng)登錄

CAS單點登錄

在面對這些場景的時候，預計很多對Spring Security OAuth2不熟悉的人恐怕會無從下手。基于上述的場景要求，如何優(yōu)雅的集成短信驗證碼登錄及第三方登錄，怎么樣才算是優(yōu)雅集成呢？有以下要求：

不侵入Spring Security OAuth2的原有代碼

對于不同的登錄方式不擴展新的端點，使用/oauth/token可以適配所有的登錄方式

可以對所有登錄方式進行兼容，抽象一套模型只要簡單的開發(fā)就可以集成登錄

基于上述的設計要求，接下來將會在文章種詳細介紹如何開發(fā)一套集成登錄認證組件開滿足上述要求。

閱讀本篇文章您需要了解OAuth2.0認證體系、SpringBoot、SpringSecurity以及Spring Cloud等相關知識

我們來看下Spring Security OAuth2的認證流程：

這個流程當中，切入點不多，集成登錄的思路如下：

在進入流程之前先進行攔截，設置集成認證的類型，例如：短信驗證碼、圖片驗證碼等信息。

在攔截的通知進行預處理，預處理的場景有很多，比如驗證短信驗證碼是否匹配、圖片驗證碼是否匹配、是否是登錄IP白名單等處理

在UserDetailService.loadUserByUsername方法中，根據(jù)之前設置的集成認證類型去獲取用戶信息，例如：通過手機號碼獲取用戶、通過微信小程序OPENID獲取用戶等等

接入這個流程之后，基本上就可以優(yōu)雅集成第三方登錄。

介紹完思路之后，下面通過代碼來展示如何實現(xiàn)：

/**
 * @author LIQIU
 * @date 2018-3-30
 **/
@Component
public class IntegrationAuthenticationFilter extends GenericFilterBean implements ApplicationContextAware {

    private static final String AUTH_TYPE_PARM_NAME = "auth_type";

    private static final String OAUTH_TOKEN_URL = "/oauth/token";

    private Collection authenticators;

    private ApplicationContext applicationContext;

    private RequestMatcher requestMatcher;

    public IntegrationAuthenticationFilter(){
        this.requestMatcher = new OrRequestMatcher(
                new AntPathRequestMatcher(OAUTH_TOKEN_URL, "GET"),
                new AntPathRequestMatcher(OAUTH_TOKEN_URL, "POST")
        );
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        if(requestMatcher.matches(request)){
            //設置集成登錄信息
            IntegrationAuthentication integrationAuthentication = new IntegrationAuthentication();
            integrationAuthentication.setAuthType(request.getParameter(AUTH_TYPE_PARM_NAME));
            integrationAuthentication.setAuthParameters(request.getParameterMap());
            IntegrationAuthenticationContext.set(integrationAuthentication);
            try{
                //預處理
                this.prepare(integrationAuthentication);

                filterChain.doFilter(request,response);

                //后置處理
                this.complete(integrationAuthentication);
            }finally {
                IntegrationAuthenticationContext.clear();
            }
        }else{
            filterChain.doFilter(request,response);
        }
    }

    /**
     * 進行預處理
     * @param integrationAuthentication
     */
    private void prepare(IntegrationAuthentication integrationAuthentication) {

        //延遲加載認證器
        if(this.authenticators == null){
            synchronized (this){
                Map integrationAuthenticatorMap = applicationContext.getBeansOfType(IntegrationAuthenticator.class);
                if(integrationAuthenticatorMap != null){
                    this.authenticators = integrationAuthenticatorMap.values();
                }
            }
        }

        if(this.authenticators == null){
            this.authenticators = new ArrayList<>();
        }

        for (IntegrationAuthenticator authenticator: authenticators) {
            if(authenticator.support(integrationAuthentication)){
                authenticator.prepare(integrationAuthentication);
            }
        }
    }

    /**
     * 后置處理
     * @param integrationAuthentication
     */
    private void complete(IntegrationAuthentication integrationAuthentication){
        for (IntegrationAuthenticator authenticator: authenticators) {
            if(authenticator.support(integrationAuthentication)){
                authenticator.complete(integrationAuthentication);
            }
        }
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }
}

在這個類種主要完成2部分工作：1、根據(jù)參數(shù)獲取當前的是認證類型，2、根據(jù)不同的認證類型調用不同的IntegrationAuthenticator.prepar進行預處理

/**
 * @author LIQIU
 * @date 2018-3-7
 **/
@Configuration
@EnableAuthorizationServer
public class AuthorizationServerConfiguration extends AuthorizationServerConfigurerAdapter {

    @Autowired
    private RedisConnectionFactory redisConnectionFactory;

    @Autowired
    private AuthenticationManager authenticationManager;

    @Autowired
    private IntegrationUserDetailsService integrationUserDetailsService;

    @Autowired
    private WebResponseExceptionTranslator webResponseExceptionTranslator;

    @Autowired
    private IntegrationAuthenticationFilter integrationAuthenticationFilter;

    @Autowired
    private DatabaseCachableClientDetailsService redisClientDetailsService;

    @Override
    public void configure(ClientDetailsServiceConfigurer clients) throws Exception {
        // TODO persist clients details
        clients.withClientDetails(redisClientDetailsService);
    }

    @Override
    public void configure(AuthorizationServerEndpointsConfigurer endpoints) {
        endpoints
                .tokenStore(new RedisTokenStore(redisConnectionFactory))
//                .accessTokenConverter(jwtAccessTokenConverter())
                .authenticationManager(authenticationManager)
                .exceptionTranslator(webResponseExceptionTranslator)
                .reuseRefreshTokens(false)
                .userDetailsService(integrationUserDetailsService);
    }

    @Override
    public void configure(AuthorizationServerSecurityConfigurer security) throws Exception {
        security.allowFormAuthenticationForClients()
                .tokenKeyAccess("isAuthenticated()")
                .checkTokenAccess("permitAll()")
                .addTokenEndpointAuthenticationFilter(integrationAuthenticationFilter);
    }

    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }

    @Bean
    public JwtAccessTokenConverter jwtAccessTokenConverter() {
        JwtAccessTokenConverter jwtAccessTokenConverter = new JwtAccessTokenConverter();
        jwtAccessTokenConverter.setSigningKey("cola-cloud");
        return jwtAccessTokenConverter;
    }
}

通過調用security. .addTokenEndpointAuthenticationFilter(integrationAuthenticationFilter);方法，將攔截器放入到認證鏈條中。

@Service
public class IntegrationUserDetailsService implements UserDetailsService {

    @Autowired
    private UpmClient upmClient;

    private List authenticators;

    @Autowired(required = false)
    public void setIntegrationAuthenticators(List authenticators) {
        this.authenticators = authenticators;
    }

    @Override
    public User loadUserByUsername(String username) throws UsernameNotFoundException {
        IntegrationAuthentication integrationAuthentication = IntegrationAuthenticationContext.get();
        //判斷是否是集成登錄
        if (integrationAuthentication == null) {
            integrationAuthentication = new IntegrationAuthentication();
        }
        integrationAuthentication.setUsername(username);
        UserVO userVO = this.authenticate(integrationAuthentication);

        if(userVO == null){
            throw new UsernameNotFoundException("用戶名或密碼錯誤");
        }

        User user = new User();
        BeanUtils.copyProperties(userVO, user);
        this.setAuthorize(user);
        return user;

    }

    /**
     * 設置授權信息
     *
     * @param user
     */
    public void setAuthorize(User user) {
        Authorize authorize = this.upmClient.getAuthorize(user.getId());
        user.setRoles(authorize.getRoles());
        user.setResources(authorize.getResources());
    }

    private UserVO authenticate(IntegrationAuthentication integrationAuthentication) {
        if (this.authenticators != null) {
            for (IntegrationAuthenticator authenticator : authenticators) {
                if (authenticator.support(integrationAuthentication)) {
                    return authenticator.authenticate(integrationAuthentication);
                }
            }
        }
        return null;
    }
}

這里實現(xiàn)了一個IntegrationUserDetailsService ，在loadUserByUsername方法中會調用authenticate方法，在authenticate方法中會當前上下文種的認證類型調用不同的IntegrationAuthenticator 來獲取用戶信息，接下來來看下默認的用戶名密碼是如何處理的：

@Component
@Primary
public class UsernamePasswordAuthenticator extends AbstractPreparableIntegrationAuthenticator {

    @Autowired
    private UcClient ucClient;

    @Override
    public UserVO authenticate(IntegrationAuthentication integrationAuthentication) {
        return ucClient.findUserByUsername(integrationAuthentication.getUsername());
    }

    @Override
    public void prepare(IntegrationAuthentication integrationAuthentication) {

    }

    @Override
    public boolean support(IntegrationAuthentication integrationAuthentication) {
        return StringUtils.isEmpty(integrationAuthentication.getAuthType());
    }
}

UsernamePasswordAuthenticator只會處理沒有指定的認證類型即是默認的認證類型，這個類中主要是通過用戶名獲取密碼。接下來來看下圖片驗證碼登錄如何處理的：

/**
 * 集成驗證碼認證
 * @author LIQIU
 * @date 2018-3-31
 **/
@Component
public class VerificationCodeIntegrationAuthenticator extends UsernamePasswordAuthenticator {

    private final static String VERIFICATION_CODE_AUTH_TYPE = "vc";

    @Autowired
    private VccClient vccClient;

    @Override
    public void prepare(IntegrationAuthentication integrationAuthentication) {
        String vcToken = integrationAuthentication.getAuthParameter("vc_token");
        String vcCode = integrationAuthentication.getAuthParameter("vc_code");
        //驗證驗證碼
        Result result = vccClient.validate(vcToken, vcCode, null);
        if (!result.getData()) {
            throw new OAuth2Exception("驗證碼錯誤");
        }
    }

    @Override
    public boolean support(IntegrationAuthentication integrationAuthentication) {
        return VERIFICATION_CODE_AUTH_TYPE.equals(integrationAuthentication.getAuthType());
    }
}

VerificationCodeIntegrationAuthenticator繼承UsernamePasswordAuthenticator，因為其只是需要在prepare方法中驗證驗證碼是否正確，獲取用戶還是用過用戶名密碼的方式獲取。但是需要認證類型為"vc"才會處理
接下來來看下短信驗證碼登錄是如何處理的：

@Component
public class SmsIntegrationAuthenticator extends AbstractPreparableIntegrationAuthenticator implements  ApplicationEventPublisherAware {

    @Autowired
    private UcClient ucClient;

    @Autowired
    private VccClient vccClient;

    @Autowired
    private PasswordEncoder passwordEncoder;

    private ApplicationEventPublisher applicationEventPublisher;

    private final static String SMS_AUTH_TYPE = "sms";

    @Override
    public UserVO authenticate(IntegrationAuthentication integrationAuthentication) {

        //獲取密碼，實際值是驗證碼
        String password = integrationAuthentication.getAuthParameter("password");
        //獲取用戶名，實際值是手機號
        String username = integrationAuthentication.getUsername();
        //發(fā)布事件，可以監(jiān)聽事件進行自動注冊用戶
        this.applicationEventPublisher.publishEvent(new SmsAuthenticateBeforeEvent(integrationAuthentication));
        //通過手機號碼查詢用戶
        UserVO userVo = this.ucClient.findUserByPhoneNumber(username);
        if (userVo != null) {
            //將密碼設置為驗證碼
            userVo.setPassword(passwordEncoder.encode(password));
            //發(fā)布事件，可以監(jiān)聽事件進行消息通知
            this.applicationEventPublisher.publishEvent(new SmsAuthenticateSuccessEvent(integrationAuthentication));
        }
        return userVo;
    }

    @Override
    public void prepare(IntegrationAuthentication integrationAuthentication) {
        String smsToken = integrationAuthentication.getAuthParameter("sms_token");
        String smsCode = integrationAuthentication.getAuthParameter("password");
        String username = integrationAuthentication.getAuthParameter("username");
        Result result = vccClient.validate(smsToken, smsCode, username);
        if (!result.getData()) {
            throw new OAuth2Exception("驗證碼錯誤或已過期");
        }
    }

    @Override
    public boolean support(IntegrationAuthentication integrationAuthentication) {
        return SMS_AUTH_TYPE.equals(integrationAuthentication.getAuthType());
    }

    @Override
    public void setApplicationEventPublisher(ApplicationEventPublisher applicationEventPublisher) {
        this.applicationEventPublisher = applicationEventPublisher;
    }
}

SmsIntegrationAuthenticator會對登錄的短信驗證碼進行預處理，判斷其是否非法，如果是非法的則直接中斷登錄。如果通過預處理則在獲取用戶信息的時候通過手機號去獲取用戶信息，并將密碼重置，以通過后續(xù)的密碼校驗。

在這個解決方案中，主要是使用責任鏈和適配器的設計模式來解決集成登錄的問題，提高了可擴展性，并對spring的源碼無污染。如果還要繼承其他的登錄，只需要實現(xiàn)自定義的IntegrationAuthenticator就可以。

項目地址：https://gitee.com/leecho/cola...
大家有好的建議和想法可以一起溝通交流。