package com.panzhihua.common.utlis.wx;
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import java.io.ByteArrayInputStream;
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import java.io.InputStream;
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import java.io.StringWriter;
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import java.security.MessageDigest;
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import java.security.SecureRandom;
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import java.util.*;
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import javax.crypto.Mac;
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import javax.crypto.spec.SecretKeySpec;
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import javax.xml.parsers.DocumentBuilder;
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import javax.xml.transform.OutputKeys;
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import javax.xml.transform.Transformer;
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import javax.xml.transform.TransformerFactory;
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import javax.xml.transform.dom.DOMSource;
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import javax.xml.transform.stream.StreamResult;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.w3c.dom.Node;
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import org.w3c.dom.NodeList;
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import com.panzhihua.common.utlis.wx.WXPayConstants.SignType;
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public class WXPayUtil {
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private static final String SYMBOLS = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
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private static final Random RANDOM = new SecureRandom();
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/**
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* XML格式字符串转换为Map
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*
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* @param strXML XML字符串
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* @return XML数据转换后的Map
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* @throws Exception
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*/
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public static Map<String, String> xmlToMap(String strXML) throws Exception {
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try {
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Map<String, String> data = new HashMap<String, String>();
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DocumentBuilder documentBuilder = WXPayXmlUtil.newDocumentBuilder();
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InputStream stream = new ByteArrayInputStream(strXML.getBytes("UTF-8"));
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org.w3c.dom.Document doc = documentBuilder.parse(stream);
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doc.getDocumentElement().normalize();
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NodeList nodeList = doc.getDocumentElement().getChildNodes();
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for (int idx = 0; idx < nodeList.getLength(); ++idx) {
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Node node = nodeList.item(idx);
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if (node.getNodeType() == Node.ELEMENT_NODE) {
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org.w3c.dom.Element element = (org.w3c.dom.Element) node;
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data.put(element.getNodeName(), element.getTextContent());
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}
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}
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try {
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stream.close();
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} catch (Exception ex) {
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// do nothing
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}
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return data;
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} catch (Exception ex) {
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WXPayUtil.getLogger().warn("Invalid XML, can not convert to map. Error message: {}. XML content: {}", ex.getMessage(), strXML);
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throw ex;
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}
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}
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/**
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* 将Map转换为XML格式的字符串
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*
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* @param data Map类型数据
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* @return XML格式的字符串
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* @throws Exception
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*/
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public static String mapToXml(Map<String, String> data) throws Exception {
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org.w3c.dom.Document document = WXPayXmlUtil.newDocument();
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org.w3c.dom.Element root = document.createElement("xml");
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document.appendChild(root);
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for (String key: data.keySet()) {
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String value = data.get(key);
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if (value == null) {
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value = "";
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}
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value = value.trim();
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org.w3c.dom.Element filed = document.createElement(key);
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filed.appendChild(document.createTextNode(value));
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root.appendChild(filed);
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}
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TransformerFactory tf = TransformerFactory.newInstance();
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Transformer transformer = tf.newTransformer();
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DOMSource source = new DOMSource(document);
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transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
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transformer.setOutputProperty(OutputKeys.INDENT, "yes");
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StringWriter writer = new StringWriter();
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StreamResult result = new StreamResult(writer);
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transformer.transform(source, result);
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String output = writer.getBuffer().toString(); //.replaceAll("\n|\r", "");
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try {
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writer.close();
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}
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catch (Exception ex) {
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}
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return output;
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}
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/**
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* 生成带有 sign 的 XML 格式字符串
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*
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* @param data Map类型数据
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* @param key API密钥
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* @return 含有sign字段的XML
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*/
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public static String generateSignedXml(final Map<String, String> data, String key) throws Exception {
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return generateSignedXml(data, key, SignType.MD5);
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}
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/**
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* 生成带有 sign 的 XML 格式字符串
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*
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* @param data Map类型数据
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* @param key API密钥
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* @param signType 签名类型
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* @return 含有sign字段的XML
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*/
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public static String generateSignedXml(final Map<String, String> data, String key, SignType signType) throws Exception {
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String sign = generateSignature(data, key, signType);
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data.put(WXPayConstants.FIELD_SIGN, sign);
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return mapToXml(data);
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}
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/**
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* 判断签名是否正确
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*
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* @param xmlStr XML格式数据
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* @param key API密钥
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* @return 签名是否正确
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* @throws Exception
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*/
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public static boolean isSignatureValid(String xmlStr, String key) throws Exception {
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Map<String, String> data = xmlToMap(xmlStr);
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if (!data.containsKey(WXPayConstants.FIELD_SIGN) ) {
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return false;
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}
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String sign = data.get(WXPayConstants.FIELD_SIGN);
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return generateSignature(data, key).equals(sign);
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}
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/**
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* 判断签名是否正确，必须包含sign字段，否则返回false。使用MD5签名。
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*
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* @param data Map类型数据
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* @param key API密钥
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* @return 签名是否正确
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* @throws Exception
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*/
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public static boolean isSignatureValid(Map<String, String> data, String key) throws Exception {
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return isSignatureValid(data, key, SignType.MD5);
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}
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/**
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* 判断签名是否正确，必须包含sign字段，否则返回false。
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*
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* @param data Map类型数据
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* @param key API密钥
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* @param signType 签名方式
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* @return 签名是否正确
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* @throws Exception
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*/
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public static boolean isSignatureValid(Map<String, String> data, String key, SignType signType) throws Exception {
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if (!data.containsKey(WXPayConstants.FIELD_SIGN) ) {
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return false;
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}
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String sign = data.get(WXPayConstants.FIELD_SIGN);
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return generateSignature(data, key, signType).equals(sign);
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}
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/**
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* 生成签名
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*
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* @param data 待签名数据
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* @param key API密钥
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* @return 签名
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*/
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public static String generateSignature(final Map<String, String> data, String key) throws Exception {
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return generateSignature(data, key, SignType.MD5);
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}
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/**
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* 生成签名. 注意，若含有sign_type字段，必须和signType参数保持一致。
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*
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* @param data 待签名数据
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* @param key API密钥
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* @param signType 签名方式
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* @return 签名
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*/
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public static String generateSignature(final Map<String, String> data, String key, SignType signType) throws Exception {
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Set<String> keySet = data.keySet();
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String[] keyArray = keySet.toArray(new String[keySet.size()]);
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Arrays.sort(keyArray);
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StringBuilder sb = new StringBuilder();
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for (String k : keyArray) {
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if (k.equals(WXPayConstants.FIELD_SIGN)) {
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continue;
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}
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if (data.get(k).trim().length() > 0) // 参数值为空，则不参与签名
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sb.append(k).append("=").append(data.get(k).trim()).append("&");
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}
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sb.append("key=").append(key);
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if (SignType.MD5.equals(signType)) {
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return MD5(sb.toString()).toUpperCase();
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}
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else if (SignType.HMACSHA256.equals(signType)) {
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return HMACSHA256(sb.toString(), key);
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}
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else {
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throw new Exception(String.format("Invalid sign_type: %s", signType));
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}
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}
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/**
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* 获取随机字符串 Nonce Str
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*
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* @return String 随机字符串
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*/
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public static String generateNonceStr() {
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char[] nonceChars = new char[32];
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for (int index = 0; index < nonceChars.length; ++index) {
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nonceChars[index] = SYMBOLS.charAt(RANDOM.nextInt(SYMBOLS.length()));
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}
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return new String(nonceChars);
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}
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/**
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* 生成 MD5
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*
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* @param data 待处理数据
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* @return MD5结果
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*/
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public static String MD5(String data) throws Exception {
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MessageDigest md = MessageDigest.getInstance("MD5");
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byte[] array = md.digest(data.getBytes("UTF-8"));
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StringBuilder sb = new StringBuilder();
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for (byte item : array) {
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sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));
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}
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return sb.toString().toUpperCase();
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}
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/**
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* 生成 HMACSHA256
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* @param data 待处理数据
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* @param key 密钥
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* @return 加密结果
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* @throws Exception
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*/
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public static String HMACSHA256(String data, String key) throws Exception {
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Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
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SecretKeySpec secret_key = new SecretKeySpec(key.getBytes("UTF-8"), "HmacSHA256");
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sha256_HMAC.init(secret_key);
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byte[] array = sha256_HMAC.doFinal(data.getBytes("UTF-8"));
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StringBuilder sb = new StringBuilder();
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for (byte item : array) {
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sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));
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}
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return sb.toString().toUpperCase();
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}
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/**
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* 日志
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* @return
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*/
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public static Logger getLogger() {
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Logger logger = LoggerFactory.getLogger("wxpay java sdk");
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return logger;
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}
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/**
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* 获取当前时间戳，单位秒
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* @return
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*/
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public static long getCurrentTimestamp() {
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return System.currentTimeMillis()/1000;
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}
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/**
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* 获取当前时间戳，单位毫秒
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* @return
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*/
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public static long getCurrentTimestampMs() {
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return System.currentTimeMillis();
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}
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}
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