AK、SK实现(双方API交互:签名及验证)

发布时间 2023-06-11 22:41:12作者: spiderMan1-1

参考:https://blog.csdn.net/yqwang75457/article/details/117815474

1、原理

AK/SK:
AK:Access Key Id,用于标示用户。
SK:Secret Access Key,是用户用于加密认证字符串和用来验证认证字符串的密钥,其中SK必须保密。
通过使用Access Key Id / Secret Access Key加密的方法来验证某个请求的发送者身份。

基本思路:
1.客户端需要在认证服务器中预先设置 access key(AK 或叫 app ID) 和 secure key(SK)。
2.在调用 API 时,客户端需要对参数和 access key 等信息结合 secure key 进行签名生成一个额外的 sign字符串。
3.服务器接收到用户的请求后,系统将使用AK对应的相同的SK和同样的认证机制生成认证字符串,并与用户请求中包含的认证字符串进行比对。如果认证字符串相同,系统认为用户拥有指定的操作权限,并执行相关操作;如果认证字符串不同,系统将忽略该操作并返回错误码。

2、实现

2.1 服务端

注解拦截器,拦截请求

@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD,ElementType.TYPE})
public @interface IdentifySk {
    String value() default "";
}

切面

@Component
@Aspect
public class IdentifyRequest {
    @Pointcut("@annotation(com.chinatower.platform.client.aop.IdentifySk)")
    public void pointCut() {
    }

    @Before(value = "pointCut()")
    public void before(JoinPoint joinPoint) {
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = attributes.getRequest();
        //获取请求头信息
        String ts = request.getHeader("ts");
        Long timeStamp = StrUtil.isNotBlank(ts) ? Long.valueOf(ts) : null;
        String msgId = request.getHeader("msgId");
        String appId = request.getHeader("appId");
        String sign = request.getHeader("sign");
        boolean res = SignUtil.checkHeaderInfo(timeStamp, msgId, appId, sign);
        Validate.isTrue(res,"请求失败,请检查请求头");
    }
}

生成sign加密工具类

@Slf4j
public class SHACoderUtil {

    public static  String sha256(String str){
        String encodeStr = "";
        try {
            MessageDigest messageDigest = MessageDigest.getInstance("SHA-256");
            messageDigest.update(str.getBytes("UTF-8"));
            encodeStr = byte2Hex(messageDigest.digest());
        } catch (Exception e) {
            log.error("sha256加码失败",e);
        }
        return encodeStr;
    }

    /**
     * 将byte转为16进制
     * @param bytes
     * @return
     */
    private static String byte2Hex(byte[] bytes){
        StringBuffer stringBuffer = new StringBuffer();
        String temp = null;
        for (int i=0;i<bytes.length;i++){
            temp = Integer.toHexString(bytes[i] & 0xFF);
            if (temp.length()==1){
                //1得到一位的进行补0操作
                stringBuffer.append("0");
            }
            stringBuffer.append(temp);
        }
        return stringBuffer.toString();
    }
}

校验工具类

public class SignUtil {

    /**
     * 按签名算法获取sign
     *
     * @param appId
     * @param appSecret
     * @param ts        时间戳
     * @param msgId     请求唯一标识
     * @return
     */
    public static String getSign(String appId, String appSecret, String ts, String msgId) {
        String str = IStringUtils.spliceStr("ts=", String.valueOf(ts), "&msgId=", msgId, "&appId=", appId, "&appSecret=", appSecret);
        // 对待加密字符串进行加密,得到sign值
        return SHACoderUtil.sha256(str);
    }


    /**
     * 鉴别 sign ,被调用方
     */
    public static boolean checkHeaderInfo(Long ts, String msgId, String appId, String sign) {
        if (ts == null || StrUtil.isBlank(msgId) || StrUtil.isBlank(appId) || StrUtil.isBlank(sign)) {
            return false;
        }
		//可以加一个利用redis防止重复请求
        //超过20分钟,表示请求无效
        if (System.currentTimeMillis() - ts > 20 * 60 * 1000) {
            return false;
        }
        //根据参数加密,验证和传来的sign是否一致
        String reSign = getSign(appId, CommonConstant.SK, String.valueOf(ts), msgId);
        if (sign.equals(reSign)) {
            return true;
        }
        return false;
    }

}

使用注解

    @IdentifySk()
    @PostMapping("/testSk")
    public void testSk() {
        System.out.println("ceshi");
    }

2.2 客户端

加密工具类,同上SHACoderUtil
生成请求头和sign工具类

public class SignUtil {
    /**
     * 构建请求头 调用方
     */
    public static Map<String, String> requestHeader(String appId, String appSecret) {
        String ts = String.valueOf(System.currentTimeMillis());
        String msgId = UUID.randomUUID().toString();
        Map<String, String> header = new HashMap<>(16);
        // 进行接口调用时的时间戳,即当前时间戳(毫秒),服务端会校验时间戳,例如时间差超过20分钟则认为请求无效,防止重复请求的攻击
        header.put("ts", ts);
        //每个请求提供一个唯一的标识符,服务器能够防止请求被多次使用
        header.put("msgId", msgId);
        header.put("appId", appId);
        String sign = getSign(appId, appSecret, ts, msgId);
        header.put("sign", sign);
        return header;
    }
    /**
     * 按签名算法获取sign(客户端和服务器端算法一致,都需要用)
     *
     * @param appId
     * @param appSecret
     * @param ts        时间戳
     * @param msgId     请求唯一标识
     * @return
     */
    public static String getSign(String appId, String appSecret, String ts, String msgId) {
        String str = IStringUtils.spliceStr("ts=", ts, "&msgId=", msgId, "&appId=", appId, "&appSecret=", appSecret);
        // 对待加密字符串进行加密,得到sign值
        return SHACoderUtil.sha256(str);
    }
}

远程请求http工具类

@Slf4j
public class HttpClientUtil {

    private static final String ENCODING_TYPE = "UTF-8";


    public static String doGet(String url, Map<String, String> param) {
        log.info("doGet方法,url={}, param={}", url, param);
        CloseableHttpClient httpclient = HttpClients.createDefault();

        String resultString = "";
        CloseableHttpResponse response = null;
        try {
            // 创建uri
            URIBuilder builder = new URIBuilder(url);
            if (param != null) {
                for (String key : param.keySet()) {
                    builder.addParameter(key, param.get(key));
                }
            }
            URI uri = builder.build();

            HttpGet httpGet = new HttpGet(uri);

            response = httpclient.execute(httpGet);

            // 判断返回状态是否为200
            if (response.getStatusLine().getStatusCode() == 200) {
                resultString = EntityUtils.toString(response.getEntity(), ENCODING_TYPE);
            }
            log.info("doGet方法返回状态={}, 结果={}", response.getStatusLine().getStatusCode(), resultString);
        } catch (Exception e) {
            log.error("发送get请求失败,原因={}", e.getLocalizedMessage());
            e.printStackTrace();
        } finally {
            try {
                if (response != null) {
                    response.close();
                }
                httpclient.close();
            } catch (IOException e) {
                log.error("关闭流失败,原因={}", e.getMessage());
                e.printStackTrace();
            }
        }
        return resultString;
    }



    public static String doPostJson(String url, String json,Integer timeOut) {
        log.info("Http 的请求地址是{}, 请求参数是 {}",url,json);
        CloseableHttpClient httpClient = HttpClients.createDefault();
        CloseableHttpResponse response = null;
        String resultString = "";
        try {
            HttpPost httpPost = new HttpPost(url);
            // 创建请求内容
            StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);
            httpPost.setEntity(entity);
            //构建超时等配置信息
            RequestConfig config = RequestConfig.custom().setConnectTimeout(timeOut) //连接超时时间
                    .setConnectionRequestTimeout(timeOut) //从连接池中取的连接的最长时间
                    .setSocketTimeout(timeOut) //数据传输的超时时间
                    .setStaleConnectionCheckEnabled(true) //提交请求前测试连接是否可用
                    .build();
            httpPost.setConfig(config);
            response = httpClient.execute(httpPost);
            resultString = EntityUtils.toString(response.getEntity(), ENCODING_TYPE);
        } catch (ConnectTimeoutException e){
            // 链接拒绝  ConnectTimeoutException
            log.error("发送post json 请求失败,原因={}", e);
            resultString = httpTimeOutOrConnect("连接超时", CommonConstant.HTTP_OUT_TIME);
        } catch (HttpHostConnectException e){
            // 链接拒绝  ConnectTimeoutException
            log.error("发送post json 请求失败,原因={}", e);
            resultString = httpTimeOutOrConnect("连接拒绝", CommonConstant.HTTP_OUT_TIME);
        } catch (SocketTimeoutException e){
            // 链接超时
            log.error("发送post json 请求失败,原因={}", e);
            resultString = httpTimeOutOrConnect("请求超时",CommonConstant.HTTP_OUT_TIME);
        } catch (Exception e) {
            // 其他异常
            log.error("发送post json 请求失败,原因={}", e);
            resultString = httpTimeOutOrConnect("请求失败",CommonConstant.HTTP_OUT_TIME_ERROR);
        } finally {
            try {
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                log.error("关闭流失败, 原因={}", e.getMessage());
                e.printStackTrace();
            }
        }
        log.info("Http 请求结果是{}",resultString);
        return resultString;
    }

    /**
     * 带请求头的的post请求
     * @param url
     * @param headMap
     * @param json
     * @param timeOut
     * @return
     */
    public static String doPostJson(String url, Map<String, String> headMap,String json,Integer timeOut) {
        log.info("Http 的请求地址是{},请求头:{}, 请求参数是 {}",url, JSON.toJSONString(headMap),json);
        CloseableHttpClient httpClient = HttpClients.createDefault();
        CloseableHttpResponse response = null;
        String resultString = "";
        try {
            HttpPost httpPost = new HttpPost(url);
            //请求头
            if (headMap != null && !headMap.isEmpty()){
                for (String key:headMap.keySet()){
                    httpPost.addHeader(key,headMap.get(key));
                }
            }
            // 创建请求内容
            if (StrUtil.isNotBlank(json)){
                StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);
                httpPost.setEntity(entity);
            }
            //构建超时等配置信息
            RequestConfig config = RequestConfig.custom().setConnectTimeout(timeOut) //连接超时时间
                    .setConnectionRequestTimeout(timeOut) //从连接池中取的连接的最长时间
                    .setSocketTimeout(timeOut) //数据传输的超时时间
                    .setStaleConnectionCheckEnabled(true) //提交请求前测试连接是否可用
                    .build();
            httpPost.setConfig(config);
            response = httpClient.execute(httpPost);
            resultString = EntityUtils.toString(response.getEntity(), ENCODING_TYPE);
        } catch (ConnectTimeoutException e){
            // 链接拒绝  ConnectTimeoutException
            log.error("发送post json 请求失败,原因={}", e);
            resultString = httpTimeOutOrConnect("连接超时", CommonConstant.HTTP_OUT_TIME);
        } catch (HttpHostConnectException e){
            // 链接拒绝  ConnectTimeoutException
            log.error("发送post json 请求失败,原因={}", e);
            resultString = httpTimeOutOrConnect("连接拒绝",CommonConstant.HTTP_OUT_TIME);
        } catch (SocketTimeoutException e){
            // 链接超时
            log.error("发送post json 请求失败,原因={}", e);
            resultString = httpTimeOutOrConnect("请求超时",CommonConstant.HTTP_OUT_TIME);
        } catch (Exception e) {
            // 其他异常
            log.error("发送post json 请求失败,原因={}", e);
            resultString = httpTimeOutOrConnect("请求失败",CommonConstant.HTTP_OUT_TIME_ERROR);
        } finally {
            try {
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                log.error("关闭流失败, 原因={}", e.getMessage());
                e.printStackTrace();
            }
        }
        log.info("Http 请求结果是{}",resultString);
        return resultString;
    }

    /**
     *
     * @return
     */
    private static String httpTimeOutOrConnect(String returnMsg, String returnCode){
        JSONObject jsonObject = new JSONObject();
        jsonObject.put("returnMsg", returnMsg);
        jsonObject.put("returnCode", returnCode);
        jsonObject.put("errorMsg", returnMsg);
        jsonObject.put("errorCode", returnCode);
        return jsonObject.toJSONString();
    }

}

测试请求服务端:

main(){
  Map<String, String> headMap = SignUtil.requestHeader(commonProperties.getAk(), commonProperties.getSk());
  HttpClientUtil.doPostJson(url, headMap, "ceshi", 60000);
}