Use UTF-8 encoding for optional tag in ss url (#918)

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>

shadowsocks-csharp/Controller/ShadowsocksController.cs

@@ -5,6 +5,7 @@ using System.Net;
 using System.Net.Sockets;
 using System.Text;
 using System.Threading;
+using System.Web;
 using Newtonsoft.Json;
 
 using Shadowsocks.Controller.Strategy;
@@ -299,11 +300,15 @@ namespace Shadowsocks.Controller
 
         public static string GetQRCode(Server server)
         {
-            string parts = server.method;
-            if (server.auth) parts += "-auth";
-            parts += ":" + server.password + "@" + server.server + ":" + server.server_port;
+            string tag = string.Empty;
+            string auth = server.auth ? "-auth" : string.Empty;
+            string parts = $"{server.method}{auth}:{server.password}@{server.server}:{server.server_port}";
             string base64 = Convert.ToBase64String(Encoding.UTF8.GetBytes(parts));
-            return "ss://" + base64;
+            if(!server.remarks.IsNullOrEmpty())
+            {
+                tag = $"#{HttpUtility.UrlEncode(server.remarks, Encoding.UTF8)}";
+            }
+            return $"ss://{base64}{tag}";
         }
 
         public void UpdatePACFromGFWList()

shadowsocks-csharp/Model/Server.cs

@@ -1,7 +1,7 @@
 using System;
 using System.Text;
 using System.Text.RegularExpressions;
-
+using System.Web;
 using Shadowsocks.Controller;
 
 namespace Shadowsocks.Model
@@ -10,7 +10,7 @@ namespace Shadowsocks.Model
     public class Server
     {
         public static readonly Regex
-            UrlFinder = new Regex("^(?i)ss://([A-Za-z0-9+-/=_]+)(#.+)?$",
+            UrlFinder = new Regex("^(?i)ss://([A-Za-z0-9+-/=_]+)(#(.+))?$",
                                   RegexOptions.IgnoreCase | RegexOptions.Compiled),
             DetailsParser = new Regex("^((?<method>.+?)(?<auth>-auth)??:(?<password>.*)@(?<hostname>.+?)" +
                                       ":(?<port>\\d+?))$", RegexOptions.Compiled | RegexOptions.IgnoreCase);
@@ -79,9 +79,9 @@ namespace Shadowsocks.Model
             var match = UrlFinder.Match(ssURL);
             if (!match.Success) throw new FormatException();
             var base64 = match.Groups[1].Value;
-            var tag = match.Groups[2].Value;
+            var tag = match.Groups[3].Value;
             if (!tag.IsNullOrEmpty())
-                remarks = tag.Substring(1).Trim();
+                remarks = HttpUtility.UrlDecode(tag, Encoding.UTF8);
             match = DetailsParser.Match(Encoding.UTF8.GetString(Convert.FromBase64String(
                 base64.PadRight(base64.Length + (4 - base64.Length % 4) % 4, '='))));
             method = match.Groups["method"].Value;

shadowsocks-csharp/shadowsocks-csharp.csproj

@@ -81,6 +81,7 @@
     <Reference Include="System.Drawing" />
     <Reference Include="System.Management" />
     <Reference Include="System.Net" />
+    <Reference Include="System.Web" />
     <Reference Include="System.Windows.Forms" />
     <Reference Include="System.Windows.Forms.DataVisualization" />
     <Reference Include="System.XML" />