2019-06-07 08:59:07 +00:00
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using System;
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using System.Net;
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using System.Security.Cryptography;
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using System.Text;
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2019-08-15 12:04:42 +00:00
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using System.Web;
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2019-06-07 08:59:07 +00:00
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using ASC.Common.Utils;
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using ASC.FederatedLogin.LoginProviders;
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using ASC.Web.Studio.Utility;
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namespace ASC.Web.Core.Utility
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{
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public interface IUrlShortener
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{
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string GetShortenLink(string shareLink);
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}
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public static class UrlShortener
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{
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public static bool Enabled { get { return !(Instance is NullShortener); } }
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private static IUrlShortener _instance;
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public static IUrlShortener Instance
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{
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get
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{
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if (_instance == null)
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{
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if (BitlyLoginProvider.Enabled)
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{
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_instance = new BitLyShortener();
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}
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else if (!string.IsNullOrEmpty(ConfigurationManager.AppSettings["web.url-shortener"]))
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{
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_instance = new OnlyoShortener();
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}
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else
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{
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_instance = new NullShortener();
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}
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}
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return _instance;
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}
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}
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}
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public class BitLyShortener : IUrlShortener
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{
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public string GetShortenLink(string shareLink)
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{
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return BitlyLoginProvider.GetShortenLink(shareLink);
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}
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}
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public class OnlyoShortener : IUrlShortener
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{
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private readonly string url;
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private readonly string internalUrl;
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private readonly string sKey;
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public OnlyoShortener()
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{
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url = ConfigurationManager.AppSettings["web.url-shortener"];
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internalUrl = ConfigurationManager.AppSettings["web.url-shortener.internal"];
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sKey = ConfigurationManager.AppSettings["core.machinekey"];
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if (!url.EndsWith("/"))
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url += '/';
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}
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public string GetShortenLink(string shareLink)
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{
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2019-08-15 15:08:40 +00:00
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using var client = new WebClient { Encoding = Encoding.UTF8 };
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client.Headers.Add("Authorization", CreateAuthToken());
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return CommonLinkUtility.GetFullAbsolutePath(url + client.DownloadString(new Uri(internalUrl + "?url=" + HttpUtility.UrlEncode(shareLink))));
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2019-06-07 08:59:07 +00:00
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}
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private string CreateAuthToken(string pkey = "urlShortener")
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{
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2019-08-15 15:08:40 +00:00
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using var hasher = new HMACSHA1(Encoding.UTF8.GetBytes(sKey));
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var now = DateTime.UtcNow.ToString("yyyyMMddHHmmss");
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var hash = Convert.ToBase64String(hasher.ComputeHash(Encoding.UTF8.GetBytes(string.Join("\n", now, pkey))));
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return string.Format("ASC {0}:{1}:{2}", pkey, now, hash);
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2019-06-07 08:59:07 +00:00
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}
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}
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public class NullShortener : IUrlShortener
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{
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public string GetShortenLink(string shareLink)
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{
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return null;
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}
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}
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}
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