package com.iups.wx.wxservice;

import java.io.UnsupportedEncodingException;

import java.security.AlgorithmParameters;

import java.security.InvalidAlgorithmParameterException;

import java.security.InvalidKeyException;

import java.security.NoSuchAlgorithmException;

import java.security.NoSuchProviderException;

import java.security.Security;

import java.security.spec.InvalidParameterSpecException;

import java.util.HashMap;

import java.util.Map;

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 net.sf.json.JSONObject;

import org.bouncycastle.jce.provider.BouncyCastleProvider;

import org.bouncycastle.util.Arrays;

import org.codehaus.xfire.util.Base64;

import com.iups.wx.common.RemoteInterfaceAddress;

import com.iups.wx.util.HttpsClientUtil;

/**

 * 微信小程序信息获取

 * @author Administrator

 * @Date 2017年2月16日 11:56:08

 */

public class WXAppletUserInfo {

    /**

     * 获取微信小程序 session_key 和 openid

     * @param code

     * @return

     */

    public JSONObject getSessionKeyOropenid(String code){

        //微信端登录code值

        String wxCode = code;

        String requestUrl = RemoteInterfaceAddress.GETSESSIONKEYOROPENID;

        Map<String,String> requestUrlParam = new HashMap<String,String>();

        requestUrlParam.put("appid", RemoteInterfaceAddress.AppletAPPID);

        requestUrlParam.put("secret", RemoteInterfaceAddress.AppletAppSecret);

        requestUrlParam.put("js_code", wxCode);

        requestUrlParam.put("grant_type", "authorization_code");

        JSONObject jsonObject = HttpsClientUtil.getInstance().sendGetRequest(requestUrl, requestUrlParam);

        return jsonObject;

    }

    /**

     * 解密用户敏感数据获取用户信息

     * @param sessionKey 数据进行加密签名的密钥

     * @param encryptedData 包括敏感数据在内的完整用户信息的加密数据

     * @param iv 加密算法的初始向量

     * @return

     */

    public JSONObject getUserInfo(String encryptedData,String sessionKey,String iv){

        // 被加密的数据

        byte[] dataByte = Base64.decode(encryptedData);

        // 加密秘钥

        byte[] keyByte = Base64.decode(sessionKey);

        // 偏移量

        byte[] ivByte = Base64.decode(iv);

        try {

               // 如果密钥不足16位，那么就补足.  这个if 中的内容很重要

            int base = 16;

            if (keyByte.length % base != 0) {

                int groups = keyByte.length / base + (keyByte.length % base != 0 ? 1 : 0);

                byte[] temp = new byte[groups * base];

                Arrays.fill(temp, (byte) 0);

                System.arraycopy(keyByte, 0, temp, 0, keyByte.length);

                keyByte = temp;

            }

            // 初始化

            Security.addProvider(new BouncyCastleProvider());

            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding","BC");

            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, "UTF-8");

                return JSONObject.fromObject(result);

            }

        } catch (NoSuchAlgorithmException e) {

            e.printStackTrace();

        } catch (NoSuchPaddingException e) {

            e.printStackTrace();

        } catch (InvalidParameterSpecException e) {

            e.printStackTrace();

        } catch (IllegalBlockSizeException e) {

            e.printStackTrace();

        } catch (BadPaddingException e) {

            e.printStackTrace();

        } catch (UnsupportedEncodingException e) {

            e.printStackTrace();

        } catch (InvalidKeyException e) {

            e.printStackTrace();

        } catch (InvalidAlgorithmParameterException e) {

            e.printStackTrace();

        } catch (NoSuchProviderException e) {

            e.printStackTrace();

        }

        return null;

    }

}