SlackFeignClient

SlackFeignClient.java

@FeignClient(name = "Slack", url = "${slack.baseUrl}", configuration = SlackFeignClientConfiguration.class)
public interface SlackFeignClient {

    @RequestMapping(
            value = "/chat.postMessage",
            method = RequestMethod.POST,
            consumes = "application/json",
            produces = "application/json")
    SlackMessageResponseDto postSlackMessage(
            @RequestBody(required = true) SlackMessageRequestDto messageRequest);
}

SlackFeignClientConfiguration.java

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;

import feign.RequestInterceptor;
import feign.RequestTemplate;

public class SlackFeignClientConfiguration {

    @Value("${slack.app.oauth.accessToken}")
    private String slackOauthAccessToken;

    @Bean
    public RequestInterceptor bearerTokenRequestInterceptor() {
        return new RequestInterceptor() {
            @Override
            public void apply(RequestTemplate template) {
                template.header("Authorization",
                        String.format("Bearer %s", slackOauthAccessToken));
            }
        };
    }
}