using System;
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using System.Collections.Generic;
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using System.Security.Cryptography;
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using System.Text;
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namespace Top.Api.Util
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{
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public class DingTalkSignatureUtil
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{
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private static string DEFAULT_ENCODING = "UTF-8";
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/* Signature method. */
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private static string ALGORITHM = "HmacSHA256";
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private static string NEW_LINE = "\n";
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// 获取签名所需要的字符串
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public static string GetCanonicalStringForIsv(long timestamp, string suiteTicket)
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{
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StringBuilder canonicalString = new StringBuilder();
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canonicalString.Append(timestamp);
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if (suiteTicket != null)
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{
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canonicalString.Append(NEW_LINE).Append(suiteTicket);
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}
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return canonicalString.ToString();
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}
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/**
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* 计算签名
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* @param canonicalString 签名
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* @param secret 签名秘钥
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* @return
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*/
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public static string ComputeSignature(string secret, string canonicalString)
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{
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byte[] signData = Sign(Encoding.UTF8.GetBytes(canonicalString), Encoding.UTF8.GetBytes(secret));
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return Convert.ToBase64String(signData);
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}
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private static byte[] Sign(byte[] key, byte[] data)
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{
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HMACSHA256 sha256 = new HMACSHA256(data);
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return sha256.ComputeHash(key);
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}
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// 拼接url参数
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public static String ParamToQueryString(IDictionary<String, String> param, String charset)
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{
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if (param == null || param.Count == 0) {
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return null;
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}
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StringBuilder paramString = new StringBuilder();
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bool first = true;
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foreach (string key in param.Keys)
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{
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string value = param[key];
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if (!first)
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{
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paramString.Append("&");
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}
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// Urlencode each request parameter
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paramString.Append(UrlEncode(key, charset));
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if (value != null)
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{
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paramString.Append("=").Append(DingTalkSignatureUtil.UrlEncode(value, charset));
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}
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first = false;
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}
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return paramString.ToString();
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}
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/**
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* Encode a URL segment with special chars replaced.
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*/
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public static String UrlEncode(String value, String encoding)
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{
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if (value == null)
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{
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return "";
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}
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String encoded = System.Web.HttpUtility.UrlEncode(value, System.Text.Encoding.UTF8);
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return encoded.Replace("+", "%20").Replace("*", "%2A")
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.Replace("~", "%7E").Replace("/", "%2F");
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}
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/**
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* 生成随机数
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* @return
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*/
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public static String GetRandomStr(int count)
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{
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String value = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
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Random random = new Random();
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StringBuilder sb = new StringBuilder();
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for (int i = 0; i < count; i++)
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{
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int number = random.Next(value.Length);
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sb.Append(CharAt(value, number));
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}
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return sb.ToString();
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}
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public static string CharAt(string value, int index)
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{
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if (index >= value.Length || index < 0)
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{
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return "";
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}
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return value.Substring(index, 1);
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}
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}
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}
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