com.gson.util.Tools.java Source code

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Here is the source code for com.gson.util.Tools.java

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/**
 * ???(JAVA) SDK
 * (c) 2012-2013 ____? <wmails@126.cn>, MIT Licensed
 * http://www.jeasyuicn.com/wechat
 */
package com.gson.util;

import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import org.apache.commons.codec.digest.DigestUtils;

public final class Tools {

    public static final String inputStream2String(InputStream in) throws UnsupportedEncodingException, 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 final 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 DigestUtils.shaHex(temp).equals(signature);
    }
}