SpringCloud Alibaba微服务实战十四 - SpringCloud Gateway集成Oauth2.0

导读：上篇文章我们已经抽取出了单独的认证服务，本章主要内容是让SpringCloud Gateway 集成Oauth2。

概念部分

在网关集成Oauth2.0后，我们的流程架构如上。主要逻辑如下：
1、客户端应用通过api网关请求认证服务器获取access_token http://localhost:8090/auth-service/oauth/token
2、认证服务器返回access_token

{
  "access_token": "f938d0c1-9633-460d-acdd-f0693a6b5f4c",
  "token_type": "bearer",
  "refresh_token": "4baea735-3c0d-4dfd-b826-91c6772a0962",
  "expires_in": 43199,
  "scope": "web"
}

3、客户端携带access_token通过API网关访问后端服务

4、API网关收到access_token后通过 AuthenticationWebFilter 对access_token认证

5、API网关转发后端请求，后端服务请求Oauth2认证服务器获取当前用户

在前面文章中我们搭建好了单独的Oauth2认证授权服务，基本功能框架都实现了，这次主要是来实现第四条，SpringCloud 整合 Oauth2 后如何进行access_token过滤校验。

代码示例

引入组件


    org.springframework.boot
    spring-boot-starter-security



    org.springframework.security
    spring-security-oauth2-resource-server



   org.springframework.cloud
   spring-cloud-starter-oauth2



    org.springframework.boot
    spring-boot-starter-jdbc



    mysql
    mysql-connector-java

主要引入跟oauth2相关的jar包，这里还需要引入数据库相关的jar包，因为我们的token是存在数据库中，要想在网关层校验token的有效性必须先从数据库取出token。

bootstrap.yml 配置修改

spring:
  application:
    name: cloud-gateway
  datasource:
    type: com.zaxxer.hikari.HikariDataSource
    url: jdbc:mysql://xx.0.xx.xx:3306/oauth2_config?characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=false
    username: xxxxx
    password: xxxxxxx
    driver-class-name: com.mysql.jdbc.Driver

主要配置oauth2的数据库连接地址

自定义认证接口管理类

在webFlux环境下通过实现 ReactiveAuthenticationManager 接口自定义认证接口管理，由于我们的token是存在jdbc中所以命名上就叫ReactiveJdbcAuthenticationManager

@Slf4j
public class ReactiveJdbcAuthenticationManager implements ReactiveAuthenticationManager {

    private TokenStore tokenStore;

    public JdbcAuthenticationManager(TokenStore tokenStore){
        this.tokenStore = tokenStore;
    }

    @Override
    public Mono authenticate(Authentication authentication) {
        return Mono.justOrEmpty(authentication)
                .filter(a -> a instanceof BearerTokenAuthenticationToken)
                .cast(BearerTokenAuthenticationToken.class)
                .map(BearerTokenAuthenticationToken::getToken)
                .flatMap((accessToken ->{
                    log.info("accessToken is :{}",accessToken);
                    OAuth2AccessToken oAuth2AccessToken = this.tokenStore.readAccessToken(accessToken);
                    //根据access_token从数据库获取不到OAuth2AccessToken
                    if(oAuth2AccessToken == null){
                        return Mono.error(new InvalidTokenException("invalid access token,please check"));
                    }else if(oAuth2AccessToken.isExpired()){
                        return Mono.error(new InvalidTokenException("access token has expired,please reacquire token"));
                    }

                    OAuth2Authentication oAuth2Authentication =this.tokenStore.readAuthentication(accessToken);
                    if(oAuth2Authentication == null){
                        return Mono.error(new InvalidTokenException("Access Token 无效!"));
                    }else {
                        return Mono.just(oAuth2Authentication);
                    }
                })).cast(Authentication.class);
    }
}

网关层的安全配置

@Configuration
public class SecurityConfig {
    private static final String MAX_AGE = "18000L";
    @Autowired
    private DataSource dataSource;
    @Autowired
    private AccessManager accessManager;

    /**
     * 跨域配置
     */
    public WebFilter corsFilter() {
        return (ServerWebExchange ctx, WebFilterChain chain) -> {
            ServerHttpRequest request = ctx.getRequest();
            if (CorsUtils.isCorsRequest(request)) {
                HttpHeaders requestHeaders = request.getHeaders();
                ServerHttpResponse response = ctx.getResponse();
                HttpMethod requestMethod = requestHeaders.getAccessControlRequestMethod();
                HttpHeaders headers = response.getHeaders();
                headers.add(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN, requestHeaders.getOrigin());
                headers.addAll(HttpHeaders.ACCESS_CONTROL_ALLOW_HEADERS, requestHeaders.getAccessControlRequestHeaders());
                if (requestMethod != null) {
                    headers.add(HttpHeaders.ACCESS_CONTROL_ALLOW_METHODS, requestMethod.name());
                }
                headers.add(HttpHeaders.ACCESS_CONTROL_ALLOW_CREDENTIALS, "true");
                headers.add(HttpHeaders.ACCESS_CONTROL_EXPOSE_HEADERS, "*");
                headers.add(HttpHeaders.ACCESS_CONTROL_MAX_AGE, MAX_AGE);
                if (request.getMethod() == HttpMethod.OPTIONS) {
                    response.setStatusCode(HttpStatus.OK);
                    return Mono.empty();
                }
            }
            return chain.filter(ctx);
        };
    }

    @Bean
    SecurityWebFilterChain webFluxSecurityFilterChain(ServerHttpSecurity http) throws Exception{
        //token管理器
        ReactiveAuthenticationManager tokenAuthenticationManager = new ReactiveJdbcAuthenticationManager(new JdbcTokenStore(dataSource));
        //认证过滤器
        AuthenticationWebFilter authenticationWebFilter = new AuthenticationWebFilter(tokenAuthenticationManager);
        authenticationWebFilter.setServerAuthenticationConverter(new ServerBearerTokenAuthenticationConverter());

        http
                .httpBasic().disable()
                .csrf().disable()
                .authorizeExchange()
                .pathMatchers(HttpMethod.OPTIONS).permitAll()
                .anyExchange().access(accessManager)
                .and()
                // 跨域过滤器
                .addFilterAt(corsFilter(), SecurityWebFiltersOrder.CORS)
                //oauth2认证过滤器
                .addFilterAt(authenticationWebFilter, SecurityWebFiltersOrder.AUTHENTICATION);
        return http.build();
    }
}

这个类是SpringCloug Gateway 与 Oauth2整合的关键，通过构建认证过滤器 AuthenticationWebFilter 完成Oauth2.0的token校验。
AuthenticationWebFilter 通过我们自定义的 ReactiveJdbcAuthenticationManager 完成token校验。
我们在这里还加入了CORS过滤器，以及权限管理器 AccessManager

权限管理器

@Slf4j
@Component
public class AccessManager implements ReactiveAuthorizationManager {
    private Set permitAll = new ConcurrentHashSet<>();
    private static final AntPathMatcher antPathMatcher = new AntPathMatcher();


    public AccessManager (){
        permitAll.add("/");
        permitAll.add("/error");
        permitAll.add("/favicon.ico");
        permitAll.add("/**/v2/api-docs/**");
        permitAll.add("/**/swagger-resources/**");
        permitAll.add("/webjars/**");
        permitAll.add("/doc.html");
        permitAll.add("/swagger-ui.html");
        permitAll.add("/**/oauth/**");
        permitAll.add("/**/current/get");
    }

    /**
     * 实现权限验证判断
     */
    @Override
    public Mono check(Mono authenticationMono, AuthorizationContext authorizationContext) {
        ServerWebExchange exchange = authorizationContext.getExchange();
        //请求资源
        String requestPath = exchange.getRequest().getURI().getPath();
        // 是否直接放行
        if (permitAll(requestPath)) {
            return Mono.just(new AuthorizationDecision(true));
        }

        return authenticationMono.map(auth -> {
            return new AuthorizationDecision(checkAuthorities(exchange, auth, requestPath));
        }).defaultIfEmpty(new AuthorizationDecision(false));

    }

    /**
     * 校验是否属于静态资源
     * @param requestPath 请求路径
     * @return
     */
    private boolean permitAll(String requestPath) {
        return permitAll.stream()
                .filter(r -> antPathMatcher.match(r, requestPath)).findFirst().isPresent();
    }

    //权限校验
    private boolean checkAuthorities(ServerWebExchange exchange, Authentication auth, String requestPath) {
        if(auth instanceof OAuth2Authentication){
            OAuth2Authentication athentication = (OAuth2Authentication) auth;
            String clientId = athentication.getOAuth2Request().getClientId();
            log.info("clientId is {}",clientId);
        }

        Object principal = auth.getPrincipal();
        log.info("用户信息:{}",principal.toString());
        return true;
    }
}

主要是过滤掉静态资源，将来一些接口权限校验也可以放在这里。