本文通过代码实例演示如何通过UAA实现微服务之间的安全调用。
uaa: 身份认证服务，同时也作为被调用的资源服务。服务端口9999。
microservice1: 调用uaa的消费者服务，服务端口8081。

1 准备工作

1.1 工程目录

--| appstack|-- uaa|-- microservice1

1.2 启动相关组件

为了简单起见，这里都使用容器启动相关组件，需要2个镜像，最好提前下载好。

• jhipster/jhipster-registry:v4.0.0
• mysql:5

a, 启动一个Jhipster-Registry

$ docker container run --name registry-app -e JHIPSTER.SECURITY.AUTHENTICATION.JWT.SECRET=dkk20dldkf0209342334 -e SPRING.PROFILES.ACTIVE=dev -d -p 8761:8761 jhipster/jhipster-registry:v4.0.0

b, 启动2个MySql容器。

$ docker container run --name uaa-mysql --privileged -e MYSQL_ROOT_PASSWORD=my-secret-pw -d -p 32900:3306 mysql:5
$ docker container run --name microservice1-mysql --privileged -e MYSQL_ROOT_PASSWORD=my-secret-pw -d -p 32800:3306 mysql:5

1.3 生成微服务工程

3个微服务都是通过Jhipster生成。 工程代码生成完之后，根据上一节启动的组件的实际情况，修改微服务配置文件中Eureka和database相关的配置。

这里使用的Jhipster版本为5.1.0。具体生成和配置详情，可以参考这里

2 核心代码

2.1 uaa源码

在uaa里面新增一个controller类，提供一个GET方法，作为被调用的API。

$ vi com.mycompany.appstack.web.rest.Provider
# 这里提供一个简单的GET APIpackage com.mycompany.appstack.web.rest;import org.springframework.web.bind.annotation.*;/*** REST controller for managing the current user's account.*/
@RestController
@RequestMapping("/api")
public class ProviderResource {public ProviderResource () {}/*** GET  /provider:*/@GetMapping("/provider")public String provider() {return "Hello, I'm uaa provider.";}}

2.2 microservice源码

a, 用于服务间调用的FeignClient注解类。

com.mycompany.appstack.config.client.AuthorizedFeignClient
生成的代码中，这个类是默认存在的，不需要修改，除非你要修改这个默认的配置类名。

Class<?>[] configuration() default OAuth2InterceptedFeignConfiguration.class;

b, 将自定义OAuth2拦截器类注册到当前服务中的配置类。

com.mycompany.appstack.client.OAuth2InterceptedFeignConfiguration
生成的代码中，这个类是默认存在的，需要修改如下：

package com.mycompany.appstack.client;import java.io.IOException;
import org.springframework.context.annotation.Bean;
import feign.RequestInterceptor;public class OAuth2InterceptedFeignConfiguration {  @Bean(name = "serviceFeignClientInterceptor")public RequestInterceptor getFeignClientInterceptor() throws IOException {return new ServiceFeignClientInterceptor();}
}

c, 自定义OAuth2拦截器类。

com.mycompany.appstack.client.ServiceFeignClientInterceptor
这是一个新增的类，内容如下：

package com.mycompany.appstack.client;import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.oauth2.common.OAuth2AccessToken;
import org.springframework.stereotype.Component;import com.mycompany.appstack.security.oauth2.ServiceTokenEndpointClient;import feign.RequestInterceptor;
import feign.RequestTemplate;@Component
public class ServiceFeignClientInterceptor implements RequestInterceptor {private final Logger log = LoggerFactory.getLogger(ServiceFeignClientInterceptor.class);private static final String AUTHORIZATION_HEADER = "Authorization";private static final String BEARER_TOKEN_TYPE = "Bearer";@Autowiredprivate ServiceTokenEndpointClient serviceTokenEndpointClient ;@Overridepublic void apply(RequestTemplate template) {OAuth2AccessToken oauthToken = serviceTokenEndpointClient .sendClentCredentialsGrant();if (oauthToken != null) {template.header(AUTHORIZATION_HEADER, String.format("%s %s", BEARER_TOKEN_TYPE, oauthToken.getValue()));}}
}

d, 与UAA通讯的客户端接口，增加一个抽象方法。

com.mycompany.appstack.security.oauth2.OAuth2TokenEndpointClient
生成的代码中，这个类是默认存在的，需要增加如下方法：

    /*** Send a client grant to the token endpoint.* * @return*/OAuth2AccessToken sendClentCredentialsGrant();

e, d的适配器类，增加对应的实现方法。

com.company.appstack.security.oauth2.OAuth2TokenEndpointClientAdapter
生成的代码中，这个类是默认存在的，需要增加如下方法：

   /*** Sends a credentials grant to the token endpoint.** @return the access token.*/@Overridepublic OAuth2AccessToken sendClentCredentialsGrant() {HttpHeaders reqHeaders = new HttpHeaders();reqHeaders.setContentType(MediaType.APPLICATION_FORM_URLENCODED);MultiValueMap<String, String> formParams = new LinkedMultiValueMap<>();formParams.set("grant_type", "client_credentials");addAuthentication(reqHeaders, formParams);HttpEntity<MultiValueMap<String, String>> entity = new HttpEntity<>(formParams, reqHeaders);log.debug("contacting OAuth2 token endpoint to authenticate internal service.");ResponseEntity<OAuth2AccessToken> responseEntity = restTemplate.postForEntity(getTokenEndpoint(), entity,OAuth2AccessToken.class);if (responseEntity.getStatusCode() != HttpStatus.OK) {log.debug("failed to authenticate user with OAuth2 token endpoint, status: {}",responseEntity.getStatusCodeValue());throw new HttpClientErrorException(responseEntity.getStatusCode());}OAuth2AccessToken accessToken = responseEntity.getBody();return accessToken;}protected String getJhipsterClientSecret() {String clientSecret = jHipsterProperties.getSecurity().getClientAuthorization().getClientSecret();if (clientSecret == null) {throw new InvalidClientException("no client-secret configured in application properties");}return clientSecret;}protected String getJhipsterClientId() {String clientId = jHipsterProperties.getSecurity().getClientAuthorization().getClientId();if (clientId == null) {throw new InvalidClientException("no client-id configured in application properties");}return clientId;}

f, e的实现类，增加对应的实现方法。

com.mycompany.appstack.security.oauth2.ServiceTokenEndpointClient
这是一个新增的类，内容如下：

package com.mycompany.appstack.security.oauth2;import com.mycompany.appstack.config.oauth2.OAuth2Properties;
import io.github.jhipster.config.JHipsterProperties;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.http.HttpHeaders;
import org.springframework.stereotype.Component;
import org.springframework.util.Base64Utils;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.RestTemplate;
import java.nio.charset.StandardCharsets;/*** Client talking to UAA's token endpoint to do different OAuth2 grants.*/
@Component
public class ServiceTokenEndpointClient extends OAuth2TokenEndpointClientAdapter implements OAuth2TokenEndpointClient {public ServiceTokenEndpointClient(@Qualifier("loadBalancedRestTemplate") RestTemplate restTemplate,JHipsterProperties jHipsterProperties, OAuth2Properties oAuth2Properties) {super(restTemplate, jHipsterProperties, oAuth2Properties);}@Overrideprotected void addAuthentication(HttpHeaders reqHeaders, MultiValueMap<String, String> formParams) {reqHeaders.add("Authorization", getAuthorizationHeader());}/*** @return a Basic authorization header to be used to talk to UAA.*/protected String getAuthorizationHeader() {String clientId = getJhipsterClientId();String clientSecret = getJhipsterClientSecret();String authorization = clientId + ":" + clientSecret;return "Basic " + Base64Utils.encodeToString(authorization.getBytes(StandardCharsets.UTF_8));}}

g, 调用uaa服务的Feign客户端类

com.mycompany.appstack.client.feign.BaseUaaAuthFeignClient
这是一个新增的类，内容如下：

package com.mycompany.appstack.client.feign;import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;import com.mycompany.appstack.client.AuthorizedFeignClient;@AuthorizedFeignClient(name = "uaa", fallback = CallUaaAuthFeignClientHystrix.class)
public interface CallUaaAuthFeignClient {@RequestMapping(value = "/api/provider", method = RequestMethod.GET)String callProvider();
}

h, g类的断路器类

com.mycompany.appstack.client.feign.CallUaaAuthFeignClientHystrix
这是一个新增的类，内容如下：

package com.mycompany.appstack.client.feign;import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;@Component
public class CallUaaAuthFeignClientHystrix implements CallUaaAuthFeignClient {private final Logger log = LoggerFactory.getLogger(this.getClass());@Overridepublic String callProvider() {log.error("调用uaa provider接口失败!");return "调用uaa provider接口失败!";}}

2.3 microservice1配置文件

application.yml

# 防止第一次初始化restTemplate时超时
hystrix:share-security-context: truecommand:default:execution:isolation:thread:timeoutInMilliseconds: 10000

application-dev.yml

jhipster:security:client-authorization:access-token-uri: http://uaa/oauth/token   // 从uaa获取token的uritoken-service-id: uaaclient-id: internal             // 和uaa的对应配置文件项保持一致client-secret: internal         // 和uaa的对应配置文件项保持一致

3 测试效果

3.1 通过UAA获取安全令牌的访问

a, 在microservice1中新增一个controller类

这个类提供一个测试API，我们通过浏览器访问这个API，间接调用CallUaaAuthFeignClient。

package com.mycompany.appstack.web.rest;import com.mycompany.appstack.client.feign.CallUaaAuthFeignClient;
import com.mycompany.appstack.service.RoleService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;/*** REST controller for Test AuthFeignClient.*/
@RestController
@RequestMapping("/test")
public class CallUaaResource {private final Logger log = LoggerFactory.getLogger(CallUaaResource.class);@Autowiredprivate CallUaaAuthFeignClient callUaaAuthFeignClient;public CallUaaResource(RoleService roleService) {}   /*** GET  /servicecall :* * @return */@GetMapping("/servicecall")public String getProvider() {log.debug("REST request to get provider from uaa.");return callUaaAuthFeignClient.callProvider();}}

b, 编译运行uaa，microservice1

如果一切正常，会看到Jhipster-Registry的Web UI中2个微服务已经注册成功。

c, 浏览器访问microservice1的测试API

http://localhost:8081/test/servicecall

可以看到uaa返回的结果：

说明microservice1从uaa获取token之后，成功访问了uaa的一个受限访问的API。

3.2 没有通过UAA获取安全令牌的访问

a, 注释掉从uaa获取安全令牌的代码

注释掉ServiceFeignClientInterceptor中的代码：

@Overridepublic void apply(RequestTemplate template) {//OAuth2AccessToken oauthToken = uaaTokenEndpointServiceClient.sendClentCredentialsGrant();//if (oauthToken != null) {//template.header(AUTHORIZATION_HEADER, String.format("%s %s", BEARER_TOKEN_TYPE, oauthToken.getValue()));//}}

b, 重新编译运行microservice1

c, 浏览器访问microservice1的测试API

http://localhost:8081/test/servicecall

可以看到返回错误信息：

查看microservice1的日志，报401错误：

org.springframework.web.client.HttpClientErrorException: 401 Unauthorized

说明microservice没有从uaa获取token，所以无法访问uaa的受限访问的API。

参考

完整源码