最近团队的各项目接入keycloak统一管理用户的登录认证，鉴权由各项目独立实现

1、在keycloak中配置client

keycloak管理界面点击client，创建client，填写clientID

有效的重定向URI配置指向工单系统的UI首页地址

启用隐式流

web起源设为 *

2、加入keycloak依赖和json文件

pom.xml

<!-- KeyCloak -->
<keycloak.version>4.4.0.Final</keycloak.version>
<dependency>
    <groupId>org.keycloak</groupId>
    <artifactId>keycloak-spring-security-adapter</artifactId>
    <version>${keycloak.version}</version>
</dependency>
<dependency>
    <groupId>org.keycloak</groupId>
    <artifactId>keycloak-spring-boot-starter</artifactId>
    <version>${keycloak.version}</version>
</dependency>

keycloak.json文件，放在resources目录下

{
  "realm": "realm",
  "auth-server-url": "http://xxx.xxx:8180/auth",
  "ssl-required": "external",
  "resource": "myclient",
  "public-client": true,
  "confidential-port": 0
}

application.properties文件

#keycloak
keycloak.realm=realm
keycloak.resource=myclient
keycloak.auth-server-url=http://xxx.xxx.xxx.xxx:8180/auth
keycloak.ssl-required=external

3、添加springsecurity+keycloak配置文件

不废话，直接上代码

@KeycloakConfiguration
@EnableGlobalMethodSecurity(prePostEnabled=true)
public class SecurityConfig extends KeycloakWebSecurityConfigurerAdapter {

    @Autowired
    private SecurityAuthenticationProvider authenticationProvider;

    @Autowired
    private KeycloakAuthenticationProcessingFilter keycloakAuthenticationProcessingFilter;

    @Autowired
    private KeycloakPreAuthActionsFilter keycloakPreAuthActionsFilter;

    @Autowired
    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
        auth.authenticationProvider(authenticationProvider);
    }

    @Bean
    public KeycloakConfigResolver keycloakConfigResolver() {
        return new KeycloakSpringBootConfigResolver();
    }

    @Bean
    public FilterRegistrationBean keycloakAuthenticationProcessingFilterRegistrationBean(
            KeycloakAuthenticationProcessingFilter filter) {
        FilterRegistrationBean registrationBean = new FilterRegistrationBean(filter);
        registrationBean.setEnabled(true);
        return registrationBean;
    }

    @Bean
    public FilterRegistrationBean keycloakPreAuthActionsFilterRegistrationBean(
            KeycloakPreAuthActionsFilter filter) {
        FilterRegistrationBean registrationBean = new FilterRegistrationBean(filter);
        registrationBean.setEnabled(true);
        return registrationBean;
    }

    @Bean
    @Override
    protected SessionAuthenticationStrategy sessionAuthenticationStrategy() {
        return new NullAuthenticatedSessionStrategy();
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {

        http.csrf().disable()
                .cors().and()
                .sessionManagement().disable()
                .authorizeRequests()
                .anyRequest().permitAll();
        http
                //.addFilterBefore(mySecurityInterceptor, FilterSecurityInterceptor.class)
                .addFilterBefore(keycloakAuthenticationProcessingFilter, FilterSecurityInterceptor.class)
                .addFilterBefore(keycloakPreAuthActionsFilter, KeycloakAuthenticationProcessingFilter.class);
    }

}

4、自定义AuthenticationProvider

通过AccessToken中的用户信息，查询本系统中该用户的权限信息，加入token，具体鉴权方案各系统各不相同，自行实现

@Slf4j
@Component
public class SecurityAuthenticationProvider implements AuthenticationProvider {

    @Autowired
    private UserService userService;
    @Autowired
    private RoleService roleService;

    private GrantedAuthoritiesMapper grantedAuthoritiesMapper;

    public void setGrantedAuthoritiesMapper(GrantedAuthoritiesMapper grantedAuthoritiesMapper) {
        this.grantedAuthoritiesMapper = grantedAuthoritiesMapper;
    }

    /**
     * 验证Authentication，建立系统使用者信息principal(token)
     */
    @Override
    public Authentication authenticate(Authentication authentication) throws RuntimeException {
        //从token中获取用户信息
        KeycloakAuthenticationToken token = (KeycloakAuthenticationToken) authentication;
        AccessToken accessToken = getAccessToken((token));
        String userId = accessToken.getSubject();
        //查询用户是否存在，若不存在则存入数据库
        userService.checkUser(accessToken, userId);
        //根据userId查询本系统用户权限，放入token中
        List<GrantedAuthority> grantedAuthorities = roleService.getGrantedAuthorities(userId);
        KeycloakAuthenticationToken authenticationToken = new KeycloakAuthenticationToken(token.getAccount(), token.isInteractive(), mapAuthorities(grantedAuthorities));
        return authenticationToken;
    }

    private AccessToken getAccessToken(KeycloakAuthenticationToken principal) {
        KeycloakAuthenticationToken token = principal;
        KeycloakPrincipal keycloakPrincipal = (KeycloakPrincipal)token.getPrincipal();
        KeycloakSecurityContext context = keycloakPrincipal.getKeycloakSecurityContext();
        return context.getToken();
    }

    private Collection<? extends GrantedAuthority> mapAuthorities(
            Collection<? extends GrantedAuthority> authorities) {
        return grantedAuthoritiesMapper != null
                ? grantedAuthoritiesMapper.mapAuthorities(authorities)
                : authorities;
    }

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

}