package com.llny.controller;

import com.google.gson.Gson;
import com.google.gson.JsonObject;
import com.llny.utils.AesCbcUtil;
import com.llny.utils.DataResponse;
import com.llny.utils.HttpRequest;
import org.springframework.web.bind.annotation.*;

import java.util.HashMap;
import java.util.Map;

@RestController
@RequestMapping(value = "/wechat")
public class WeChaConnView {
    /**
     * 解密用户敏感数据
     *
     * @param encryptedData 明文,加密数据
     * @param iv      加密算法的初始向量
     * @param code     用户允许登录后，回调内容会带上 code（有效期五分钟），开发者需要将 code 发送到开发者服务器后台，使用code 换取 session_key api，将 code 换成 openid 和 session_key
     * @return
     */
    @ResponseBody
    @PostMapping(value = "/decodeUser")
    public DataResponse decodeUser(@RequestParam("encryptedData")String encryptedData, @RequestParam("iv")String iv, @RequestParam("code")String code) {
        DataResponse response = new DataResponse();
        Map<String, Object> map = new HashMap<>();

        //登录凭证不能为空
        if (code == null || code.length() == 0) {
            /*map.put("status", 0);
            map.put("msg", "code 不能为空");

            return map;*/
            response.setResult_code("failed");
            response.setResult_msg("code 不能为空");

            return response;
        }

        //小程序唯一标识  (在微信小程序管理后台获取)
        String wxspAppid = "appid";
        //小程序的 app secret (在微信小程序管理后台获取)
        String wxspSecret = "appsecret";
        //授权（必填）
        String grant_type = "authorization_code";

        //////////////// 1、向微信服务器 使用登录凭证 code 获取 session_key 和 openid ////////////////
        //请求参数
        String params = "appid=" + wxspAppid + "&secret=" + wxspSecret + "&js_code=" + code + "&grant_type=" + grant_type;
        //发送请求
        String sr = HttpRequest.sendGet("https://api.weixin.qq.com/sns/jscode2session", params);
        //解析相应内容（转换成json对象）
        Gson gson = new Gson();
        JsonObject json = gson.fromJson(sr, JsonObject.class);
        System.out.println(json);
//      JSONObject json = JSONObject.fromObject(sr);

        if (json.get("session_key") == null) {
            /*map.put("status", 0);
            map.put("msg", "解密失败");

            return map;*/
            response.setResult_code("failed");
            response.setResult_msg("解密失败:" + json.get("errmsg").toString().replaceAll("\"", ""));

            return response;
        }
        //获取会话密钥（session_key）
        String session_key = json.get("session_key").toString();
        //用户的唯一标识（openid）
//      String openid = (String) json.get("openid");
        String openid = json.get("openid").toString();

        //////////////// 2、对encryptedData加密数据进行AES解密 ////////////////
        String data = encryptedData.replaceAll("[+]", "%2B");
        try {
            String result = AesCbcUtil.decrypt(data, session_key, iv, "UTF-8");
            if (null != result && result.length() > 0) {
                /*map.put("status", 1);
                map.put("msg", "解密成功"); */

                JsonObject userInfoJSON = gson.fromJson(result, JsonObject.class);
//              JSONObject userInfoJSON = JSONObject.fromObject(result);
                System.out.println("user: " + userInfoJSON);
                Map<String, Object> userInfo = new HashMap<>();
                userInfo.put("openId", openid.replaceAll("\"", ""));
                userInfo.put("phoneNumber", userInfoJSON.get("phoneNumber").toString().replaceAll("\"", ""));
                userInfo.put("purePhoneNumber", userInfoJSON.get("purePhoneNumber").toString().replaceAll("\"", ""));
                userInfo.put("countryCode", userInfoJSON.get("countryCode").toString().replaceAll("\"", ""));
                map.put("userInfo", userInfo);
                System.out.println("map: " + map);

                response.setResult_code("success");
                response.setResult_msg("解密成功");
                response.setData(userInfo);

                return response;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        /*map.put("status", 0);
        map.put("msg", "解密失败");

        return map;*/
        response.setResult_code("failed");
        response.setResult_msg("解密失败");

        return response;
    }

}

package com.llny.utils;

import org.apache.commons.codec.binary.Base64;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.UnsupportedEncodingException;
import java.security.*;
import java.security.spec.InvalidParameterSpecException;

/**
 * Created by lsh
 * AES-128-CBC 加密方式
 * 注：
 * AES-128-CBC可以自己定义“密钥”和“偏移量“。
 * AES-128是jdk自动生成的“密钥”。
 */
public class AesCbcUtil {
    static {
        //BouncyCastle是一个开源的加解密解决方案，主页在http://www.bouncycastle.org/
        Security.addProvider(new BouncyCastleProvider());
    }
    /**
     * AES解密
     *
     * @param data      //密文，被加密的数据
     * @param key      //秘钥
     * @param iv       //偏移量
     * @param encodingFormat //解密后的结果需要进行的编码
     * @return
     * @throws Exception
     */
    public static String decrypt(String data, String key, String iv, String encodingFormat) throws Exception {
//    initialize();

        //被加密的数据
        byte[] dataByte = Base64.decodeBase64(data);
        //加密秘钥
        byte[] keyByte = Base64.decodeBase64(key);
        //偏移量
        byte[] ivByte = Base64.decodeBase64(iv);


        try {
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");

            SecretKeySpec spec = new SecretKeySpec(keyByte, "AES");

            AlgorithmParameters parameters = AlgorithmParameters.getInstance("AES");
            parameters.init(new IvParameterSpec(ivByte));

            cipher.init(Cipher.DECRYPT_MODE, spec, parameters);// 初始化

            byte[] resultByte = cipher.doFinal(dataByte);
            if (null != resultByte && resultByte.length > 0) {
                String result = new String(resultByte, encodingFormat);
                return result;
            }
            return null;
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidParameterSpecException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (InvalidAlgorithmParameterException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        return null;
    }
}

package com.llny.utils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

public class HttpRequest {
    /**
     * 向指定URL发送GET方法的请求
     *
     * @param url
     *      发送请求的URL
     * @param param
     *      请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return URL 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }

    /**
     * 向指定 URL 发送POST方法的请求
     *
     * @param url
     *      发送请求的 URL
     * @param param
     *      请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数
            out.print(param);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送 POST 请求出现异常！"+e);
            e.printStackTrace();
        }
        //使用finally块来关闭输出流、输入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    }

}

package com.llny.utils;

import com.github.pagehelper.PageInfo;

public class DataResponse {


    //信息详情
    private String result_msg;

    //成功失败信息
    private String result_code;

    //公共通知编码
    private String result_num;

    private PageInfo page;
    private Object data;

    public DataResponse(){}

    public DataResponse(Object data){
        this.data = data;
    }

    public DataResponse(String result_code,String result_msg){
        this.result_code = result_code;
        this.result_msg  = result_msg;
    }

    public DataResponse(String result_code,String result_msg,String result_num){
        this.result_code = result_code;
        this.result_msg  = result_msg;
        this.result_num = result_num;
    }


    public String getResult_num() {
        return result_num;
    }

    public void setResult_num(String result_num) {
        this.result_num = result_num;
    }

    public String getResult_msg() {
        return result_msg;
    }

    public void setResult_msg(String result_msg) {
        this.result_msg = result_msg;
    }

    public String getResult_code() {
        return result_code;
    }

    public void setResult_code(String result_code) {
        this.result_code = result_code;
    }


    public Object getData() {
        return data;
    }

    public void setData(Object data) {

        this.data = data;
    }

    public PageInfo getPage() {
        return page;
    }

    public void setPage(PageInfo page) {
        this.page = page;
    }
}