package cn.licoy.encryptbody.advice;
import cn.licoy.encryptbody.annotation.decrypt.AESDecryptBody;
import cn.licoy.encryptbody.annotation.decrypt.DESDecryptBody;
import cn.licoy.encryptbody.annotation.decrypt.DecryptBody;
import cn.licoy.encryptbody.annotation.decrypt.RSADecryptBody;
import cn.licoy.encryptbody.bean.DecryptAnnotationInfoBean;
import cn.licoy.encryptbody.bean.DecryptHttpInputMessage;
import cn.licoy.encryptbody.config.EncryptBodyConfig;
import cn.licoy.encryptbody.enums.DecryptBodyMethod;
import cn.licoy.encryptbody.exception.DecryptBodyFailException;
import cn.licoy.encryptbody.exception.DecryptMethodNotFoundException;
import cn.licoy.encryptbody.util.AESEncryptUtil;
import cn.licoy.encryptbody.util.CheckUtils;
import cn.licoy.encryptbody.util.DESEncryptUtil;
import cn.licoy.encryptbody.util.StringUtils;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.io.IOUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.MethodParameter;
import org.springframework.core.annotation.Order;
import org.springframework.http.HttpInputMessage;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.RequestBodyAdvice;
import java.io.IOException;
import java.io.InputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
/**
* 请求数据的加密信息解密处理<br>
* 本类只对控制器参数中含有<strong>{@link org.springframework.web.bind.annotation.RequestBody}</strong>
* 以及package为<strong><code>cn.licoy.encryptbody.annotation.decrypt</code></strong>下的注解有效
* @see RequestBodyAdvice
* @author licoy.cn
* @version 2018/9/7
*/
@Order(1)
@ControllerAdvice
@Slf4j
public class DecryptRequestBodyAdvice implements RequestBodyAdvice {
@Autowired
private EncryptBodyConfig config;
@Override
public boolean supports(MethodParameter methodParameter, Type targetType, Class<? extends HttpMessageConverter<?>> converterType) {
Annotation[] annotations = methodParameter.getDeclaringClass().getAnnotations();
if(annotations!=null && annotations.length>0){
for (Annotation annotation : annotations) {
if(annotation instanceof DecryptBody ||
annotation instanceof AESDecryptBody ||
annotation instanceof DESDecryptBody ||
annotation instanceof RSADecryptBody){
return true;
}
}
}
return methodParameter.getMethod().isAnnotationPresent(DecryptBody.class) ||
methodParameter.getMethod().isAnnotationPresent(AESDecryptBody.class) ||
methodParameter.getMethod().isAnnotationPresent(DESDecryptBody.class) ||
methodParameter.getMethod().isAnnotationPresent(RSADecryptBody.class);
}
@Override
public Object handleEmptyBody(Object body, HttpInputMessage inputMessage, MethodParameter parameter, Type targetType, Class<? extends HttpMessageConverter<?>> converterType) {
return body;
}
@Override
public HttpInputMessage beforeBodyRead(HttpInputMessage inputMessage, MethodParameter parameter, Type targetType, Class<? extends HttpMessageConverter<?>> converterType) throws IOException {
if(inputMessage.getBody()==null){
return inputMessage;
}
String body;
try {
body = IOUtils.toString(inputMessage.getBody(),config.getEncoding());
}catch (Exception e){
throw new DecryptBodyFailException("Unable to get request body data," +
" please check if the sending data body or request method is in compliance with the specification." +
" (无法获取请求正文数据，请检查发送数据体或请求方法是否符合规范。)");
}
if(body==null || StringUtils.isNullOrEmpty(body)){
throw new DecryptBodyFailException("The request body is NULL or an empty string, so the decryption failed." +
" (请求正文为NULL或为空字符串，因此解密失败。)");
}
String decryptBody = null;
DecryptAnnotationInfoBean methodAnnotation = this.getMethodAnnotation(parameter);
if(methodAnnotation!=null){
decryptBody = switchDecrypt(body,methodAnnotation);
}else{
DecryptAnnotationInfoBean classAnnotation = this.getClassAnnotation(parameter.getDeclaringClass());
if(classAnnotation!=null){
decryptBody = switchDecrypt(body,classAnnotation);
}
}
if(decryptBody==null){
throw new DecryptBodyFailException("Decryption error, " +
"please check if the selected source data is encrypted correctly." +
" (解密错误，请检查选择的源数据的加密方式是否正确。)");
}
try {
InputStream inputStream = IOUtils.toInputStream(decryptBody, config.getEncoding());
return new DecryptHttpInputMessage(inputStream,inputMessage.getHeaders());
}catch (Exception e){
throw new DecryptBodyFailException("The string is converted to a stream format exception." +
" Please check if the format such as encoding is correct." +
" (字符串转换成流格式异常，请检查编码等格式是否正确。)");
}
}
@Override
public Object afterBodyRead(Object body, HttpInputMessage inputMessage, MethodParameter parameter, Type targetType, Class<? extends HttpMessageConverter<?>> converterType) {
return body;
}
/**
* 获取方法控制器上的加密注解信息
* @param methodParameter 控制器方法
* @return 加密注解信息
*/
private DecryptAnnotationInfoBean getMethodAnnotation(MethodParameter methodParameter){
if(methodParameter.getMethod().isAnnotationPresent(DecryptBody.class)){
DecryptBody decryptBody = methodParameter.getMethodAnnotation(DecryptBody.class);
return DecryptAnnotationInfoBean.builder()
.decryptBodyMethod(decryptBody.value())
.key(decryptBody.otherKey())
.build();
}
if(methodParameter.getMethod().isAnnotationPresent(DESDecryptBody.class)){
return DecryptAnnotationInfoBean.builder()
.decryptBodyMethod(DecryptBodyMethod.DES)
.key(methodParameter.getMethodAnnotation(DESDecryptBody.class).otherKey())
.build();
}
if(methodParameter.getMethod().isAnnotationPresent(AESDecryptBody.class)){
return DecryptAnnotationInfoBean.builder()
.decryptBodyMethod(DecryptBodyMethod.AES)
.key(methodParameter.getMethodAnnotation(AESDecryptBody.class).otherKey())
.build();
}
return null;
}
/**
* 获取类控制器上的加密注解信息
* @param clazz 控制器类
* @return 加密注解信息
*/
private DecryptAnnotationInfoBean getClassAnnotation(Class clazz){
Annotation[] annotations = clazz.getDeclaredAnnotations();
if(annotations!=null && annotations.length>0){
for (Annotation annotation : annotations) {
if(annotation instanceof DecryptBody){
DecryptBody decryptBody = (DecryptBody) annotation;
return DecryptAnnotationInfoBean.builder()
.decryptBodyMethod(decryptBody.value())
.key(decryptBody.otherKey())
.build();
}
if(annotation instanceof DESDecryptBody){
return DecryptAnnotationInfoBean.builder()
.decryptBodyMethod(DecryptBodyMethod.DES)
.key(((DESDecryptBody) annotation).otherKey())
.build();
}
if(annotation instanceof AESDecryptBody){
return DecryptAnnotationInfoBean.builder()
.decryptBodyMethod(DecryptBodyMethod.AES)
.key(((AESDecryptBody) annotation).otherKey())
.build();
}
}
}
return null;
}
/**
* 选择加密方式并进行解密
* @param formatStringBody 目标解密字符串
* @param infoBean 加密信息
* @return 解密结果
*/
private String switchDecrypt(String formatStringBody,DecryptAnnotationInfoBean infoBean){
DecryptBodyMethod method = infoBean.getDecryptBodyMethod();
if(method==null) throw new DecryptMethodNotFoundException();
String key = infoBean.getKey();
if(method == DecryptBodyMethod.DES){
key = CheckUtils.checkAndGetKey(config.getDesKey(),key,"DES-KEY");
return DESEncryptUtil.decrypt(formatStringBody,key);
}
if(method == DecryptBodyMethod.AES){
key = CheckUtils.checkAndGetKey(config.getAesKey(),key,"AES-KEY");
return AESEncryptUtil.decrypt(formatStringBody,key);
}
throw new DecryptBodyFailException();
}
}
