HTTP BASIC AUTHENTICATION by Java RestTemplate

今天在接入EMQX 管理架空API時，必須使用HTTP BASIC AUTHENTICATION。

 

對應的，我把日誌打印出來：

RdeMacBook-Pro:~ r$ curl -v --basic -u username:password http://127.0.0.1:8081/hello/
*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 8081 (#0)
* Server auth using Basic with user 'username'
> GET /hello/ HTTP/1.1
> Host: 127.0.0.1:8081
> Authorization: Basic dXNlcm5hbWU6cGFzc3dvcmQ=
> User-Agent: curl/7.63.0
> Accept: */*
> 
< HTTP/1.1 200 
< Content-Type: text/plain;charset=UTF-8
< Content-Length: 29
< Date: Mon, 01 Apr 2019 12:05:47 GMT
< 
hello world ! from port 8081
* Connection #0 to host 127.0.0.1 left intact
RdeMacBook-Pro:~ r$ 

發現，Http Header裏有"Authorization: Basic dXNlcm5hbWU6cGFzc3dvcmQ="，其實是把username:password經過base64加密後得到：

RdeMacBook-Pro:~ r$ echo -n username:password | openssl base64
dXNlcm5hbWU6cGFzc3dvcmQ=
RdeMacBook-Pro:~ r$ 

在Java的實現，可以通過RestTemplateBuilder.basicAuthentication(username, password).build()獲取對應的 RestTemplate:

@Component
public class EmqRestTemplateImplService {

    @Value("${xh.im.mqtt.emq.http.username}")
    private String emqUserName;

    @Value("${xh.im.mqtt.emq.http.password}")
    private String emqPassword;

    @Autowired
    public RestTemplateBuilder restTemplateBuilder;

    @Bean("emqRestTemplate")
    public RestTemplate getRestTemplate() {
        return restTemplateBuilder.basicAuthentication(emqUserName, emqPassword).build();
    }
}

使用方法：

@Service
public class EmqApiService {

    @Autowired
    public RestTemplate emqRestTemplate;

    @Value("${xh.im.mqtt.emq.http.api.subscribe}")
    private String emqSubscribeUrl;

    public void setSubscription(List<String> topicList, Integer qos, String clientId) {

           emqRestTemplate.postForEntity(this.emqSubscribeUrl, "", String.class);
    }

}