SpringCloud 中 Feign 调用添加 Oauth2 Authorization Header

SpringCloud 中通过 Feign 调用其他服务，当服务使用 Oauth2 授权的时候，Feign 默认并不会将认证的 TOKEN 带在请求的 Header 中，需要手动实现传递 TOKEN 的配置；通过实现feign.RequestInterceptor来实现自定义添加认证信息

• FeignOauth2RequestInterceptor.java

import feign.RequestInterceptor;
import feign.RequestTemplate;
import lombok.extern.slf4j.Slf4j;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContext;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.oauth2.provider.authentication.OAuth2AuthenticationDetails;
import org.springframework.context.annotation.Configuration;

@Configuration
public class FeignOauth2RequestInterceptor implements RequestInterceptor {

    private final String AUTHORIZATION_HEADER = "Authorization";
    private final String BEARER_TOKEN_TYPE = "Bearer";

    @Override
    public void apply(RequestTemplate requestTemplate) {
        SecurityContext securityContext = SecurityContextHolder.getContext();
        Authentication authentication = securityContext.getAuthentication();
        if (authentication != null && authentication.getDetails() instanceof OAuth2AuthenticationDetails) {
            OAuth2AuthenticationDetails details = (OAuth2AuthenticationDetails) authentication.getDetails();
            requestTemplate.header(AUTHORIZATION_HEADER, String.format("%s %s", BEARER_TOKEN_TYPE, details.getTokenValue()));
        }

    }
}

这样就可以将请求的认证信息放入到 Header 中，通过认证

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