package blighkit.wechat.util; import org.dom4j.Document; import org.dom4j.DocumentHelper; import org.dom4j.Element; import java.io.IOException; import java.io.InputStream; import java.security.MessageDigest; import java.util.*; public final class Tools { private static final char[] HEX_DIGITS = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'}; public static String sha1(String str) { if (str == null) { return null; } try { MessageDigest messageDigest = MessageDigest.getInstance("SHA1"); messageDigest.update(str.getBytes()); byte[] bytes = messageDigest.digest(); int len = bytes.length; StringBuilder buf = new StringBuilder(len * 2); for (int j = 0; j < len; j++) { buf.append(HEX_DIGITS[(bytes[j] >> 4) & 0x0f]); buf.append(HEX_DIGITS[bytes[j] & 0x0f]); } return buf.toString(); } catch (Exception e) { throw new RuntimeException(e); } } public static boolean checkSignature(String token, String signature, String timestamp, String nonce) { List<String> params = new ArrayList<String>(); params.add(token); params.add(timestamp); params.add(nonce); Collections.sort(params, new Comparator<String>() { @Override public int compare(String o1, String o2) { return o1.compareTo(o2); } }); String temp = params.get(0) + params.get(1) + params.get(2); return sha1(temp).equals(signature); } public static String inputStream2String(InputStream in) throws IOException { if (in == null) return ""; StringBuffer out = new StringBuffer(); byte[] b = new byte[4096]; for (int n; (n = in.read(b)) != -1; ) { out.append(new String(b, 0, n, "UTF-8")); } return out.toString(); } public static Map<String, String> xml2Map(String xml) { Map<String, String> map = new HashMap<String, String>(); try { Document document = DocumentHelper.parseText(xml); Element list = document.getRootElement(); List<Element> elements = list.elements(); for (Element element : elements) { map.put(element.getName().trim(), element.getStringValue()); } } catch (Exception e) { throw new RuntimeException(e); } return map; } }