本文主要内容是通过SpringCloud Gateway构建一个网关微服务，作为统一的认证授权和访问入口。

配置文件

先引入相关依赖，对应的pom文件内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>oauth2-demo</artifactId>
        <groupId>com.zjq</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>ms-gateway</artifactId>

    <dependencies>
        <!-- spring cloud gateway -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-gateway</artifactId>
        </dependency>
        <!-- eureka client -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <!-- commons 公共项目 -->
        <dependency>
            <groupId>com.zjq</groupId>
            <artifactId>commons</artifactId>
            <version>1.0-SNAPSHOT</version>
            <!-- 和 webflux 冲突 -->
            <exclusions>
                <exclusion>
                    <groupId>com.battcn</groupId>
                    <artifactId>swagger-spring-boot-starter</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- 自定义的元数据依赖 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies>

</project>

网关服务的yml配置内容如下：

server:
  port: 80

spring:
  application:
    name: ms-gateway
  cloud:
    gateway:
      discovery:
        locator:
          enabled: true # 开启配置注册中心进行路由功能
          lower-case-service-id: true # 将服务名称转小写
      routes:
        - id: ms-users
          uri: lb://ms-users
          predicates:
            - Path=/users/**
          filters:
            - StripPrefix=1

        - id: ms-oauth2-server
          uri: lb://ms-oauth2-server
          predicates:
            - Path=/auth/**
          filters:
            - StripPrefix=1

secure:
  ignore:
    urls: # 配置白名单路径
      - /actuator/**
      - /auth/oauth/**
      - /users/signin

# 配置 Eureka Server 注册中心
eureka:
  instance:
    prefer-ip-address: true
    instance-id: ${spring.cloud.client.ip-address}:${server.port}
  client:
    service-url:
      defaultZone: http://localhost:7000/eureka/

logging:
  pattern:
    console: '%d{HH:mm:ss} [%thread] %-5level %logger{50} - %msg%n'

请求白名单配置

加载配置文件中的配置，注入到spring容器中。

secure:
  ignore:
    urls: # 配置白名单路径
      - /actuator/**
      - /auth/oauth/**
      - /users/signin

/**
 * 网关白名单配置
 * @author zjq
 */
@Data
@Component
@ConfigurationProperties(prefix = "secure.ignore")
public class IgnoreUrlsConfig {

    private List<String> urls;

}

异常处理和rest请求配置

异常处理在全局过滤器中会有用到，代码如下：

@Component
public class HandleException {

    @Resource
    private ObjectMapper objectMapper;

    public Mono<Void> writeError(ServerWebExchange exchange, String error) {
        ServerHttpResponse response = exchange.getResponse();
        ServerHttpRequest request = exchange.getRequest();
        response.setStatusCode(HttpStatus.OK);
        response.getHeaders().add(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE);
        ResultInfo resultInfo = ResultInfoUtil.buildError(ApiConstant.NO_LOGIN_CODE, ApiConstant.NO_LOGIN_MESSAGE, request.getURI().getPath());
        String resultInfoJson = null;
        DataBuffer buffer = null;
        try {
            resultInfoJson = objectMapper.writeValueAsString(resultInfo);
            buffer = response.bufferFactory().wrap(resultInfoJson.getBytes(Charset.forName("UTF-8")));
        } catch (JsonProcessingException ex) {
            ex.printStackTrace();
        }

        return response.writeWith(Mono.just(buffer));
    }

}

申请授权和认证过程中需要远程调用其他接口，所以我们引入rest请求配置，代码如下：

/**
 * REST请求配置
 * @author zjq
 */
@Configuration
public class RestTemplateConfiguration {

    @LoadBalanced
    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }

}

全局过滤器配置

配置好了白名单，我们需要在网关过滤器中使用该白名单配置，放行对应的白名单，网关过滤器需要实现全局过滤器接口org.springframework.cloud.gateway.filter.GlobalFilter和过滤器顺序接口org.springframework.core.Ordered相关代码如下：

/**
 * 网关全局过滤器
 * @author zjq
 */
@Component
public class AuthGlobalFilter implements GlobalFilter, Ordered {

    @Resource
    private IgnoreUrlsConfig ignoreUrlsConfig;
    @Resource
    private RestTemplate restTemplate;
    @Resource
    private HandleException handleException;

    /**
     * 身份校验处理
     *
     * @param exchange
     * @param chain
     * @return
     */
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        // 判断当前的请求是否在白名单中
        AntPathMatcher pathMatcher = new AntPathMatcher();
        boolean flag = false;
        String path = exchange.getRequest().getURI().getPath();
        for (String url : ignoreUrlsConfig.getUrls()) {
            if (pathMatcher.match(url, path)) {
                flag = true;
                break;
            }
        }
        // 白名单放行
        if (flag) {
            return chain.filter(exchange);
        }
        // 获取 access_token
        String access_token = exchange.getRequest().getQueryParams().getFirst("access_token");
        // 判断 access_token 是否为空
        if (StringUtils.isBlank(access_token)) {
            return handleException.writeError(exchange, "请登录");
        }
        // 校验 token 是否有效
        String checkTokenUrl = "http://ms-oauth2-server/oauth/check_token?token=".concat(access_token);
        try {
            // 发送远程请求，验证 token
            ResponseEntity<String> entity = restTemplate.getForEntity(checkTokenUrl, String.class);
            // token 无效的业务逻辑处理
            if (entity.getStatusCode() != HttpStatus.OK) {
                return handleException.writeError(exchange,
                        "Token was not recognised, token: ".concat(access_token));
            }
            if (StringUtils.isBlank(entity.getBody())) {
                return handleException.writeError(exchange,
                        "This token is invalid: ".concat(access_token));
            }
        } catch (Exception e) {
            return handleException.writeError(exchange,
                    "Token was not recognised, token: ".concat(access_token));
        }
        // 放行
        return chain.filter(exchange);
    }

    /**
     * 网关过滤器的排序，数字越小优先级越高
     *
     * @return
     */
    @Override
    public int getOrder() {
        return 0;
    }

}

测试验证

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