<%@ page contentType="text/html; charset=UTF-8" %>
<%@ page import="com.alibaba.fastjson.JSONObject" %>
<%@ page import="javax.crypto.Cipher" %>
<%@ page import="java.nio.charset.StandardCharsets" %>
<%@ page import="javax.crypto.spec.SecretKeySpec" %>
<%@ page import="javax.crypto.spec.IvParameterSpec" %>
<%@ page import="org.apache.commons.codec.binary.Base64" %>
<%@ page import="java.util.Map" %>
<%@ page import="org.apache.http.client.methods.CloseableHttpResponse" %>
<%@ page import="org.apache.http.impl.client.CloseableHttpClient" %>
<%@ page import="org.apache.http.impl.client.HttpClients" %>
<%@ page import="org.apache.http.client.methods.HttpPost" %>
<%@ page import="org.apache.http.entity.StringEntity" %>
<%@ page import="org.apache.http.HttpEntity" %>
<%@ page import="org.apache.http.util.EntityUtils" %>
<%@ page import="java.io.IOException" %>
<%@ page import="java.util.HashMap" %>
<jsp:useBean id="rs" class="weaver.conn.RecordSet" scope="page" />
<jsp:useBean id="rs1" class="weaver.conn.RecordSet" scope="page" />
<%

    JSONObject jsonObject = new JSONObject();

    String APP_SECRET = "YVBKbcEQSXlwcpOxjOGRhODWASSkzg";
    String data = System.currentTimeMillis() + "||" + APP_SECRET;
    String IV = APP_SECRET.substring(APP_SECRET.length() - 16);
    String key = APP_SECRET.substring(0, 16);


    String sign = encryptData(data, key, IV);
    System.out.println(sign);


    String url = "http://192.168.10.54:7123/hklearn/api/access/getUserToken";
    String username = "SZ001";
    Map<String,String> headers = new HashMap<>();
    String encode = "utf-8";

    JSONObject param = new JSONObject();
    param.put("username",username);
    param.put("sign",sign);


    jsonObject.put("url",url);
    jsonObject.put("sign",sign);
    jsonObject.put("username",username);

    String token = httpGetToken(url,param.toString(),headers,"utf-8");
    jsonObject.put("token",token);

    out.print(jsonObject.toJSONString());

%>

<%!
    /**
     *
     * @param data 需要加密的数据
     * @param key 秘钥
     * @param IV 偏移量
     * @return
     */
    private static String encryptData(String data, String key, String IV) {
        try {
            //算法/模式/填充模式  AES/CBC/PKCS5Padding
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            byte[] dataBytes = data.getBytes(StandardCharsets.UTF_8);
            int plaintextLength = dataBytes.length;
            byte[] plaintext = new byte[plaintextLength];
            System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);
            SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
            IvParameterSpec ivspec = new IvParameterSpec(IV.getBytes());
            cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
            byte[] encrypted = cipher.doFinal(plaintext);
            //输出内容，Base64处理
            return new String(Base64.encodeBase64(encrypted));
        } catch (Exception e) {
            return null;
        }
    }

    /**
     * 发送 http post 请求，参数以原生字符串进行提交
     * @param url
     * @param encode
     * @return
     */
    public static String httpGetToken(String url, String stringJson, Map<String,String> headers, String encode){
        if(encode == null){
            encode = "utf-8";
        }
        String result = "";
        CloseableHttpResponse httpResponse = null;
        CloseableHttpClient closeableHttpClient = null;
        try {

            //HttpClients.createDefault()等价于 HttpClientBuilder.create().build();
            closeableHttpClient = HttpClients.createDefault();
            HttpPost httpost = new HttpPost(url);

            //设置header
            httpost.setHeader("Content-type", "application/json");
            if (headers != null && headers.size() > 0) {
                for (Map.Entry<String, String> entry : headers.entrySet()) {
                    httpost.setHeader(entry.getKey(),entry.getValue());
                }
            }
            //组织请求参数
            StringEntity stringEntity = new StringEntity(stringJson, encode);
            httpost.setEntity(stringEntity);

            //响应信息
            httpResponse = closeableHttpClient.execute(httpost);
            HttpEntity entity = httpResponse.getEntity();
            String content = EntityUtils.toString(entity, encode);
            if(content != null && !"".equals(content)){
                JSONObject jsonObject = JSONObject.parseObject(content);
                int code = (int) jsonObject.get("code");
                if(code==10000){
                    String data = jsonObject.get("data").toString();
                    JSONObject jsonObject1 = JSONObject.parseObject(data);
                    result = jsonObject1.get("accessToken").toString();
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            try {
                httpResponse.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        try {  //关闭连接、释放资源
            closeableHttpClient.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 发送 http post 请求，参数以原生字符串进行提交
     * @param url
     * @param encode
     * @return
     */
    public static boolean httpPostJson(String url, String stringJson, Map<String,String> headers, String encode){
        if(encode == null){
            encode = "utf-8";
        }
        boolean result = false;
        CloseableHttpResponse httpResponse = null;
        CloseableHttpClient closeableHttpClient = null;
        try {

            //HttpClients.createDefault()等价于 HttpClientBuilder.create().build();
            closeableHttpClient = HttpClients.createDefault();
            HttpPost httpost = new HttpPost(url);

            //设置header
            httpost.setHeader("Content-type", "application/json");
            if (headers != null && headers.size() > 0) {
                for (Map.Entry<String, String> entry : headers.entrySet()) {
                    httpost.setHeader(entry.getKey(),entry.getValue());
                }
            }
            //组织请求参数
            StringEntity stringEntity = new StringEntity(stringJson, encode);
            httpost.setEntity(stringEntity);

            //响应信息
            httpResponse = closeableHttpClient.execute(httpost);
            HttpEntity entity = httpResponse.getEntity();
            String content = EntityUtils.toString(entity, encode);
            if(content != null && !"".equals(content)){
                JSONObject jsonObject = JSONObject.parseObject(content);
                int code = (int) jsonObject.get("code");
                if(code==10000){
                    result = true;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            try {
                httpResponse.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        try {  //关闭连接、释放资源
            closeableHttpClient.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

%>