目录

背景

在前后端分离的项目中，一般后端返回给前端的格式是一个固定的json格式。在这个前提下，Spring Cloud OAuth2 生成access token的请求/oauth/token的返回内容就需要自定义。

访问/oauth/token示例如下：

原始返回值的格式如下：

我们希望使用我们自己固定的json格式，如下：

实现原理

原理就是通过切面编程实现对/oauth/token端点请求的结果进行拦截封装处理，由于/oauth/token是Spring Cloud OAuth2的内部端点，因此需要对相关的Spring源码进行分析。最终定位到

org.springframework.security.oauth2.provider.endpoint.TokenEndpoint.postAccessToken（）

方法上。

代码实现

相关类

CodeEnum.java

package com.wongoing.common.model;

/**
 * @description: 代码枚举
 * @author: zheng
 * @date: Created in 2021/1/26 11:18
 * @version: 0.0.1
 * @modified By:
 */
public enum CodeEnum {
    SUCCESS(0),
    ERROR(1);

    private Integer code;

    CodeEnum(Integer code) {
        this.code = code;
    }

    public Integer getCode() {
        return this.code;
    }
}

Result.java

package com.wongoing.common.model;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.io.Serializable;

/**
 * @description: Rest API 接口方法返回类型定义
 * @author: zheng
 * @date: Created in 2021/1/26 13:25
 * @version: 0.0.1
 * @modified By:
 */
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Result implements Serializable {
    private T data;
    private Integer code;
    private String msg;

    public static  Result of(T data, Integer code, String msg) {
        return new Result<>(data, code, msg);
    }

    public static  Result succeed(String msg) {
        return of(null, CodeEnum.SUCCESS.getCode(), msg);
    }

    public static  Result succeed(T model, String msg) {
        return of(model, CodeEnum.SUCCESS.getCode(), msg);
    }

    public static  Result succeed(T model) {
        return of(model, CodeEnum.SUCCESS.getCode(), "");
    }

    public static  Result failed(String msg) {
        return of(null, CodeEnum.ERROR.getCode(), msg);
    }

    public static  Result failed(T model, String msg) {
        return of(model, CodeEnum.ERROR.getCode(), msg);
    }
}

关键切面拦截器

在uaa项目中定义OauthTokenAspect.java

package com.wongoing.oauth2.filter;

import com.wongoing.common.constant.SecurityConstants;
import com.wongoing.common.context.TenantContextHolder;
import com.wongoing.common.model.Result;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.security.authentication.InsufficientAuthenticationException;
import org.springframework.security.core.Authentication;
import org.springframework.security.oauth2.common.OAuth2AccessToken;
import org.springframework.security.oauth2.common.util.OAuth2Utils;
import org.springframework.security.oauth2.provider.OAuth2Authentication;
import org.springframework.stereotype.Component;

import java.security.Principal;
import java.util.Map;

/**
 * @description: oauth-token拦截器
 * 1. 赋值租户
 * 2. 统一返回token格式
 *
 * @author: zheng
 * @date: Created in 2021/7/12 16:25
 * @version: 0.0.1
 * @modified By:
 */
@Slf4j
@Component
@Aspect
public class OauthTokenAspect {

    @Around("execution(* org.springframework.security.oauth2.provider.endpoint.TokenEndpoint.postAccessToken(..))")
    public Object handleControllerMethod(ProceedingJoinPoint joinPoint) throws Throwable {
        try {
            Object[] args = joinPoint.getArgs();
            Principal principal = (Principal) args[0];
            if (!(principal instanceof Authentication)) {
                throw new InsufficientAuthenticationException("There is no client authentication. Try adding an appropriate authentication filter.");
            }
            String clientId = this.getClientId(principal);
            Map parameters = (Map) args[1];
            String grantType = parameters.get(OAuth2Utils.GRANT_TYPE);

            //保存租户id
            TenantContextHolder.setTenant(clientId);
            Object proceed = joinPoint.proceed();
            if (SecurityConstants.AUTHORIZATION_CODE.equals(grantType)) {
                /**
                 * 如果使用 @EnableOAuth2Sso 注解不能修改返回格式，否则授权码模式可以统一改
                 * 因为本项目的 sso-demo/ss-sso 里面使用了 @EnableOAuth2Sso 注解，所以这里就不修改授权码模式的token返回值了
                 */
                return proceed;
            } else {
                ResponseEntity responseEntity = (ResponseEntity) proceed;
                OAuth2AccessToken body = responseEntity.getBody();
                return ResponseEntity
                        .status(HttpStatus.OK)
                        .body(Result.succeed(body));
            }
        } finally {
            TenantContextHolder.clear();
        }
    }

    private String getClientId(Principal principal) {
        Authentication client = (Authentication) principal;
        if (!client.isAuthenticated()) {
            throw new InsufficientAuthenticationException("The client is not authenticated.");
        }
        String clientId = client.getName();
        if (client instanceof OAuth2Authentication) {
            clientId = ((OAuth2Authentication) client).getOAuth2Request().getClientId();
        }
        return clientId;
    }
}

其中的常量值：

public abstract class OAuth2Utils {
	public static final String GRANT_TYPE = "grant_type";
}

public interface SecurityConstants {
	/**
     * 授权码模式
     */
    String AUTHORIZATION_CODE = "authorization_code";
}

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