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package com.firefly.wechat.utils;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import java.io.StringReader;

/**
 * XMLParse class
 * 
 * 提供提取消息格式中的密文及生成回复消息格式的接口.
 */
class XMLParser {

    /**
     * 提取出xml数据包中的加密消息
     *
     * @param xml 待提取的xml字符串
     * @return 提取出的加密消息字符串
     * @throws AesException
     */
    public static Object[] extract(String xml) throws AesException {
        Object[] result = new Object[3];
        try {
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            DocumentBuilder db = dbf.newDocumentBuilder();
            StringReader sr = new StringReader(xml);
            InputSource is = new InputSource(sr);
            Document document = db.parse(is);

            Element root = document.getDocumentElement();
            NodeList nodelist1 = root.getElementsByTagName("Encrypt");
            NodeList nodelist2 = root.getElementsByTagName("ToUserName");
            result[0] = 0;
            result[1] = nodelist1.item(0).getTextContent();
            result[2] = nodelist2.item(0).getTextContent();
            return result;
        } catch (Exception e) {
            throw new AesException(AesException.ParseXmlError, e);
        }
    }

    /**
     * 生成xml消息
     *
     * @param encrypt   加密后的消息密文
     * @param signature 安全签名
     * @param timestamp 时间戳
     * @param nonce     随机字符串
     * @return 生成的xml字符串
     */
    public static String generate(String encrypt, String signature, String timestamp, String nonce) {

        String format = "\n" + "\n"
                + "\n"
                + "%3$s\n" + "\n" + "";
        return String.format(format, encrypt, signature, timestamp, nonce);

    }
}