Hidistro.UI.Web/API/APIHelper.cs

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namespace Hidistro.UI.Web.API
{
    using System;
    using System.Collections.Generic;
    using System.IO;
    using System.IO.Compression;
    using System.Net;
    using System.Security.Cryptography;
    using System.Text;

    public class APIHelper
    {
        public static string BuildSign(Dictionary<string, string> dicArray, string key, string sign_type, string _input_charset)
        {
            return Sign(CreateLinkstring(dicArray) + key, sign_type, _input_charset);
        }

        public static bool CheckSign(SortedDictionary<string, string> tmpParas, string keycode, string sign)
        {
            return (BuildSign(Parameterfilter(tmpParas), keycode, "MD5", "utf-8") == sign);
        }

        public static string CreateLinkstring(Dictionary<string, string> dicArray)
        {
            StringBuilder builder = new StringBuilder();
            foreach (KeyValuePair<string, string> pair in dicArray)
            {
                builder.Append(pair.Key + "=" + pair.Value + "&");
            }
            int length = builder.Length;
            builder.Remove(length - 1, 1);
            return builder.ToString();
        }

        public static Dictionary<string, string> Parameterfilter(SortedDictionary<string, string> dicArrayPre)
        {
            Dictionary<string, string> dictionary = new Dictionary<string, string>();
            foreach (KeyValuePair<string, string> pair in dicArrayPre)
            {
                if (((pair.Key.ToLower() != "sign") && (pair.Key.ToLower() != "sign_type")) && ((pair.Value != "") && (pair.Value != null)))
                {
                    string key = pair.Key.ToLower();
                    dictionary.Add(key, pair.Value);
                }
            }
            return dictionary;
        }

        public static string PostData(string url, string postData)
        {
            string str = string.Empty;
            try
            {
                Uri requestUri = new Uri(url);
                HttpWebRequest request = (HttpWebRequest) WebRequest.Create(requestUri);
                byte[] bytes = Encoding.UTF8.GetBytes(postData);
                request.Method = "POST";
                request.ContentType = "application/x-www-form-urlencoded";
                request.ContentLength = bytes.Length;
                using (Stream stream = request.GetRequestStream())