From d21e84476c0d8689fcaa872cd5c7d4c5346678c2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=BCrgen?= <info@emvoll.de>
Date: Tue, 19 Jul 2016 21:15:22 +0200
Subject: [PATCH] AuthenticationFactory

---
 SpotifyAPI/SpotifyAPI.csproj                 |  1 +
 SpotifyAPI/Web/Auth/AuthenticationFactory.cs | 85 ++++++++++++++++++++
 SpotifyAPI/Web/SimpleHttpServer.cs           | 16 +++-
 3 files changed, 100 insertions(+), 2 deletions(-)
 create mode 100644 SpotifyAPI/Web/Auth/AuthenticationFactory.cs

diff --git a/SpotifyAPI/SpotifyAPI.csproj b/SpotifyAPI/SpotifyAPI.csproj
index 3f025e4b..e414942c 100644
--- a/SpotifyAPI/SpotifyAPI.csproj
+++ b/SpotifyAPI/SpotifyAPI.csproj
@@ -58,6 +58,7 @@
     </Compile>
     <Compile Include="Local\Models\SpotifyUri.cs" />
     <Compile Include="Local\VolumeMixerControl.cs" />
+    <Compile Include="Web\Auth\AuthenticationFactory.cs" />
     <Compile Include="Web\Enums\TimeRangeType.cs" />
     <Compile Include="Web\IClient.cs" />
     <Compile Include="Local\Models\CFID.cs" />
diff --git a/SpotifyAPI/Web/Auth/AuthenticationFactory.cs b/SpotifyAPI/Web/Auth/AuthenticationFactory.cs
new file mode 100644
index 00000000..2653ef11
--- /dev/null
+++ b/SpotifyAPI/Web/Auth/AuthenticationFactory.cs
@@ -0,0 +1,85 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using SpotifyAPI.Web.Enums;
+using SpotifyAPI.Web.Models;
+
+namespace SpotifyAPI.Web.Auth
+{
+    public class AuthenticationFactory
+    {
+        private readonly string m_RedirectUrl;
+        private readonly int m_ListeningPort;
+        private readonly string m_ClientId;
+        private readonly TimeSpan m_Timeout;
+        private Scope m_Scope;
+
+        public AuthenticationFactory(string redirectUrl, int listeningPort, string clientId, Scope scope, TimeSpan timeout)
+        {
+            m_RedirectUrl = redirectUrl;
+            m_ListeningPort = listeningPort;
+            m_ClientId = clientId;
+            m_Scope = scope;
+            m_Timeout = timeout;
+        }
+
+        public Task<SpotifyWebAPI> GetWebApi()
+        {
+            var authentication = new ImplicitGrantAuth
+            {
+                RedirectUri = $"{m_RedirectUrl}:{m_ListeningPort}",
+                ClientId = m_ClientId,
+                Scope = m_Scope,
+                State = "XSS"
+            };
+
+            AutoResetEvent authenticationWaitFlag = new AutoResetEvent(false);
+            SpotifyWebAPI spotifyWebApi = null;
+            authentication.OnResponseReceivedEvent += (token, state) =>
+            {
+                spotifyWebApi = HandleSpotifyResponse(state, token);
+                authenticationWaitFlag.Set();
+            };
+
+            authentication.StartHttpServer(m_ListeningPort);
+
+            authentication.DoAuth();
+
+            authenticationWaitFlag.WaitOne(m_Timeout);
+            if (spotifyWebApi == null)
+                throw new TimeoutException($"No valid response received for the last {m_Timeout.TotalSeconds} seconds");
+
+            authentication.StopHttpServer();
+
+            return Task.FromResult(spotifyWebApi);
+        }
+
+        private static SpotifyWebAPI HandleSpotifyResponse(string state, Token token)
+        {
+            if (state != "XSS")
+                throw new SpotifyWebApiException($"Wrong state '{state}' received.");
+
+            if (token.Error != null)
+                throw new SpotifyWebApiException($"Error: {token.Error}");
+            
+            var spotifyWebApi = new SpotifyWebAPI
+            {
+                UseAuth = true,
+                AccessToken = token.AccessToken,
+                TokenType = token.TokenType
+            };
+
+            return spotifyWebApi;
+        }
+    }
+
+    [Serializable]
+    public class SpotifyWebApiException : Exception
+    {
+        public SpotifyWebApiException(string message) : base(message)
+        { }
+    }
+}
diff --git a/SpotifyAPI/Web/SimpleHttpServer.cs b/SpotifyAPI/Web/SimpleHttpServer.cs
index 1f417b6c..369d7629 100644
--- a/SpotifyAPI/Web/SimpleHttpServer.cs
+++ b/SpotifyAPI/Web/SimpleHttpServer.cs
@@ -223,8 +223,20 @@ namespace SpotifyAPI.Web
                 {
                     while (IsActive)
                     {
-                        TcpClient s = _listener.AcceptTcpClient();
-                        processor.Process(s);
+                        _listener.BeginAcceptTcpClient(ar =>
+                        {
+                            try
+                            {
+                                TcpListener listener = (TcpListener)ar.AsyncState;
+                                var tcpCLient = listener.EndAcceptTcpClient(ar);
+                                processor.Process(tcpCLient);
+
+                            }
+                            catch (ObjectDisposedException)
+                            {
+                                // Ignore
+                            }
+                        }, _listener);
                     }
                 }
             }