Added Retry Handler and removed old enums

SpotifyAPI.Web.Examples.ASP/Startup.cs

@@ -4,7 +4,6 @@ using Microsoft.AspNetCore.Hosting;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
-using SpotifyAPI.Web.Enums;
 
 namespace SpotifyAPI.Web.Examples.ASP
 {
@@ -26,8 +25,8 @@ namespace SpotifyAPI.Web.Examples.ASP
         .AddCookie()
         .AddSpotify(options =>
         {
-          var scopes = Scope.UserLibraryRead | Scope.UserModifyPlaybackState;
+          // var scopes = Scope.UserLibraryRead | Scope.UserModifyPlaybackState;
-          options.Scope.Add(scopes.GetStringAttribute(","));
+          // options.Scope.Add(scopes.GetStringAttribute(","));
 
           options.SaveTokens = true;
           options.ClientId = Configuration["client_id"];

SpotifyAPI.Web.Tests/Http/APIConnectorTest.cs

@@ -0,0 +1,95 @@
+using System;
+using System.Net;
+using System.Net.Http;
+using System.Threading.Tasks;
+using Moq;
+using NUnit.Framework;
+using SpotifyAPI.Web.Http;
+
+namespace SpotifyAPI.Web.Tests
+{
+  [TestFixture]
+  public class APIConnectorTest
+  {
+    [Test]
+    public async Task RetryHandler_IsUsed()
+    {
+      var apiResponse = new Mock<IAPIResponse<string>>();
+      apiResponse.SetupGet(a => a.Body).Returns("Hello World");
+
+      var response = new Mock<IResponse>();
+      response.SetupGet(r => r.ContentType).Returns("application/json");
+      response.SetupGet(r => r.StatusCode).Returns(HttpStatusCode.OK);
+      response.SetupGet(r => r.Body).Returns("\"Hello World\"");
+
+      var authenticator = new Mock<IAuthenticator>();
+      var serializer = new Mock<IJSONSerializer>();
+      serializer.Setup(s => s.DeserializeResponse<string>(It.IsAny<IResponse>())).Returns(apiResponse.Object);
+
+      var httpClient = new Mock<IHTTPClient>();
+      var retryHandler = new Mock<IRetryHandler>();
+      retryHandler.Setup(r =>
+        r.HandleRetry(
+          It.IsAny<IRequest>(),
+          It.IsAny<IResponse>(),
+          It.IsAny<Func<IRequest, Task<IResponse>>>()
+        )
+      ).Returns(Task.FromResult(response.Object));
+
+      var apiConnector = new APIConnector(
+        new Uri("https://spotify.com"),
+        authenticator.Object,
+        serializer.Object,
+        httpClient.Object,
+        retryHandler.Object
+      );
+      await apiConnector.SendAPIRequest<string>(new Uri("/me", UriKind.Relative), HttpMethod.Get);
+
+      authenticator.Verify(a => a.Apply(It.IsAny<IRequest>()), Times.Once);
+      httpClient.Verify(h => h.DoRequest(It.IsAny<IRequest>()), Times.Once);
+      serializer.Verify(s => s.DeserializeResponse<string>(response.Object), Times.Once);
+    }
+
+    [Test]
+    public async Task RetryHandler_CanRetry()
+    {
+      var apiResponse = new Mock<IAPIResponse<string>>();
+      apiResponse.SetupGet(a => a.Body).Returns("Hello World");
+
+      var response = new Mock<IResponse>();
+      response.SetupGet(r => r.ContentType).Returns("application/json");
+      response.SetupGet(r => r.StatusCode).Returns(HttpStatusCode.OK);
+      response.SetupGet(r => r.Body).Returns("\"Hello World\"");
+
+      var authenticator = new Mock<IAuthenticator>();
+      var serializer = new Mock<IJSONSerializer>();
+      serializer.Setup(s => s.DeserializeResponse<string>(It.IsAny<IResponse>())).Returns(apiResponse.Object);
+
+      var httpClient = new Mock<IHTTPClient>();
+      httpClient.Setup(h => h.DoRequest(It.IsAny<IRequest>())).Returns(Task.FromResult(response.Object));
+
+      var retryHandler = new Mock<IRetryHandler>();
+      retryHandler.Setup(r =>
+        r.HandleRetry(
+          It.IsAny<IRequest>(),
+          It.IsAny<IResponse>(),
+          It.IsAny<Func<IRequest, Task<IResponse>>>()
+        )
+      ).Returns((IRequest request, IResponse response, Func<IRequest, Task<IResponse>> retry) => retry(request));
+
+      var apiConnector = new APIConnector(
+        new Uri("https://spotify.com"),
+        authenticator.Object,
+        serializer.Object,
+        httpClient.Object,
+        retryHandler.Object
+      );
+      await apiConnector.SendAPIRequest<string>(new Uri("/me", UriKind.Relative), HttpMethod.Get);
+
+      serializer.Verify(s => s.SerializeRequest(It.IsAny<IRequest>()), Times.Once);
+      authenticator.Verify(a => a.Apply(It.IsAny<IRequest>()), Times.Exactly(2));
+      httpClient.Verify(h => h.DoRequest(It.IsAny<IRequest>()), Times.Exactly(2));
+      serializer.Verify(s => s.DeserializeResponse<string>(response.Object), Times.Once);
+    }
+  }
+}

SpotifyAPI.Web.Tests/UtilTest.cs

@@ -1,18 +0,0 @@
-using System;
-using NUnit.Framework;
-
-namespace SpotifyAPI.Web.Tests
-{
-  [TestFixture]
-  public class UtilTest
-  {
-    [Test]
-    public void TimestampShouldBeNoFloatingPoint()
-    {
-      string timestamp = DateTime.Now.ToUnixTimeMillisecondsPoly().ToString();
-
-      StringAssert.DoesNotContain(".", timestamp);
-      StringAssert.DoesNotContain(",", timestamp);
-    }
-  }
-}

SpotifyAPI.Web/Clients/SpotifyClientConfig.cs

@@ -9,6 +9,7 @@ namespace SpotifyAPI.Web
     public IAuthenticator Authenticator { get; }
     public IJSONSerializer JSONSerializer { get; }
     public IHTTPClient HTTPClient { get; }
+    public IRetryHandler RetryHandler { get; }
 
     /// <summary>
     ///   This config spefies the internal parts of the SpotifyClient.
@@ -19,17 +20,20 @@ namespace SpotifyAPI.Web
     /// <param name="authenticator"></param>
     /// <param name="jsonSerializer"></param>
     /// <param name="httpClient"></param>
+    /// <param name="retryHandler"></param>
     public SpotifyClientConfig(
       Uri baseAddress,
       IAuthenticator authenticator,
       IJSONSerializer jsonSerializer,
-      IHTTPClient httpClient
+      IHTTPClient httpClient,
+      IRetryHandler retryHandler
     )
     {
       BaseAddress = baseAddress;
       Authenticator = authenticator;
       JSONSerializer = jsonSerializer;
       HTTPClient = httpClient;
+      RetryHandler = retryHandler;
     }
 
     internal IAPIConnector CreateAPIConnector()
@@ -40,7 +44,7 @@ namespace SpotifyAPI.Web
       Ensure.PropertyNotNull(JSONSerializer, nameof(JSONSerializer));
       Ensure.PropertyNotNull(HTTPClient, nameof(HTTPClient));
 
-      return new APIConnector(BaseAddress, Authenticator, JSONSerializer, HTTPClient);
+      return new APIConnector(BaseAddress, Authenticator, JSONSerializer, HTTPClient, RetryHandler);
     }
 
     public SpotifyClientConfig WithToken(string token, string tokenType = "Bearer")
@@ -50,11 +54,14 @@ namespace SpotifyAPI.Web
       return WithAuthenticator(new TokenHeaderAuthenticator(token, tokenType));
     }
 
+    public SpotifyClientConfig WithRetryHandler(IRetryHandler retryHandler)
+    {
+      return new SpotifyClientConfig(BaseAddress, Authenticator, JSONSerializer, HTTPClient, retryHandler);
+    }
+
     public SpotifyClientConfig WithAuthenticator(IAuthenticator authenticator)
     {
-      Ensure.ArgumentNotNull(authenticator, nameof(authenticator));
+      return new SpotifyClientConfig(BaseAddress, authenticator, JSONSerializer, HTTPClient, RetryHandler);
-
-      return new SpotifyClientConfig(BaseAddress, Authenticator, JSONSerializer, HTTPClient);
     }
 
     public static SpotifyClientConfig CreateDefault(string token, string tokenType = "Bearer")
@@ -79,7 +86,8 @@ namespace SpotifyAPI.Web
         SpotifyUrls.API_V1,
         authenticator,
         new NewtonsoftJSONSerializer(),
-        new NetHttpClient()
+        new NetHttpClient(),
+        null
       );
     }
   }

SpotifyAPI.Web/Enums/AlbumType.cs

@@ -1,23 +0,0 @@
-using System;
-
-namespace SpotifyAPI.Web.Enums
-{
-  [Flags]
-  public enum AlbumType
-  {
-    [String("album")]
-    Album = 1,
-
-    [String("single")]
-    Single = 2,
-
-    [String("compilation")]
-    Compilation = 4,
-
-    [String("appears_on")]
-    AppearsOn = 8,
-
-    [String("album,single,compilation,appears_on")]
-    All = 16
-  }
-}

SpotifyAPI.Web/Enums/FollowType.cs

@@ -1,14 +0,0 @@
-using System;
-
-namespace SpotifyAPI.Web.Enums
-{
-  [Flags]
-  public enum FollowType
-  {
-    [String("artist")]
-    Artist = 1,
-
-    [String("user")]
-    User = 2
-  }
-}

SpotifyAPI.Web/Enums/RepeatState.cs

@@ -1,17 +0,0 @@
-using System;
-
-namespace SpotifyAPI.Web.Enums
-{
-  [Flags]
-  public enum RepeatState
-  {
-    [String("track")]
-    Track = 1,
-
-    [String("context")]
-    Context = 2,
-
-    [String("off")]
-    Off = 4
-  }
-}

SpotifyAPI.Web/Enums/Scope.cs

@@ -1,68 +0,0 @@
-using System;
-
-namespace SpotifyAPI.Web.Enums
-{
-  [Flags]
-  public enum Scope
-  {
-    [String("")]
-    None = 1,
-
-    [String("playlist-modify-public")]
-    PlaylistModifyPublic = 2,
-
-    [String("playlist-modify-private")]
-    PlaylistModifyPrivate = 4,
-
-    [String("playlist-read-private")]
-    PlaylistReadPrivate = 8,
-
-    [String("streaming")]
-    Streaming = 16,
-
-    [String("user-read-private")]
-    UserReadPrivate = 32,
-
-    [String("user-read-email")]
-    UserReadEmail = 64,
-
-    [String("user-library-read")]
-    UserLibraryRead = 128,
-
-    [String("user-library-modify")]
-    UserLibraryModify = 256,
-
-    [String("user-follow-modify")]
-    UserFollowModify = 512,
-
-    [String("user-follow-read")]
-    UserFollowRead = 1024,
-
-    [String("user-read-birthdate")]
-    UserReadBirthdate = 2048,
-
-    [String("user-top-read")]
-    UserTopRead = 4096,
-
-    [String("playlist-read-collaborative")]
-    PlaylistReadCollaborative = 8192,
-
-    [String("user-read-recently-played")]
-    UserReadRecentlyPlayed = 16384,
-
-    [String("user-read-playback-state")]
-    UserReadPlaybackState = 32768,
-
-    [String("user-modify-playback-state")]
-    UserModifyPlaybackState = 65536,
-
-    [String("user-read-currently-playing")]
-    UserReadCurrentlyPlaying = 131072,
-
-    [String("app-remote-control")]
-    AppRemoteControl = 262144,
-
-    [String("ugc-image-upload")]
-    UgcImageUpload = 524288
-  }
-}

SpotifyAPI.Web/Enums/SearchType.cs

@@ -1,23 +0,0 @@
-using System;
-
-namespace SpotifyAPI.Web.Enums
-{
-  [Flags]
-  public enum SearchType
-  {
-    [String("artist")]
-    Artist = 1,
-
-    [String("album")]
-    Album = 2,
-
-    [String("track")]
-    Track = 4,
-
-    [String("playlist")]
-    Playlist = 8,
-
-    [String("track,album,artist,playlist")]
-    All = 16
-  }
-}

SpotifyAPI.Web/Enums/TimeRangeType.cs

@@ -1,20 +0,0 @@
-using System;
-
-namespace SpotifyAPI.Web.Enums
-{
-  /// <summary>
-  ///     Only one value allowed
-  /// </summary>
-  [Flags]
-  public enum TimeRangeType
-  {
-    [String("long_term")]
-    LongTerm = 1,
-
-    [String("medium_term")]
-    MediumTerm = 2,
-
-    [String("short_term")]
-    ShortTerm = 4
-  }
-}

SpotifyAPI.Web/Enums/TrackType.cs

@@ -1,20 +0,0 @@
-using System;
-
-namespace SpotifyAPI.Web.Enums
-{
-  [Flags]
-  public enum TrackType
-  {
-    [String("track")]
-    Track = 1,
-
-    [String("episode")]
-    Episode = 2,
-
-    [String("ad")]
-    Ad = 4,
-
-    [String("unknown")]
-    Unknown = 8
-  }
-}

SpotifyAPI.Web/Http/APIConnector.cs

@@ -12,16 +12,23 @@ namespace SpotifyAPI.Web.Http
     private readonly IAuthenticator _authenticator;
     private readonly IJSONSerializer _jsonSerializer;
     private readonly IHTTPClient _httpClient;
+    private readonly IRetryHandler _retryHandler;
 
     public APIConnector(Uri baseAddress, IAuthenticator authenticator) :
-      this(baseAddress, authenticator, new NewtonsoftJSONSerializer(), new NetHttpClient())
+      this(baseAddress, authenticator, new NewtonsoftJSONSerializer(), new NetHttpClient(), null)
     { }
-    public APIConnector(Uri baseAddress, IAuthenticator authenticator, IJSONSerializer jsonSerializer, IHTTPClient httpClient)
+    public APIConnector(
+      Uri baseAddress,
+      IAuthenticator authenticator,
+      IJSONSerializer jsonSerializer,
+      IHTTPClient httpClient,
+      IRetryHandler retryHandler)
     {
       _baseAddress = baseAddress;
       _authenticator = authenticator;
       _jsonSerializer = jsonSerializer;
       _httpClient = httpClient;
+      _retryHandler = retryHandler;
     }
 
     public Task<T> Delete<T>(Uri uri)
@@ -106,7 +113,7 @@ namespace SpotifyAPI.Web.Http
       _httpClient.SetRequestTimeout(timeout);
     }
 
-    private async Task<T> SendAPIRequest<T>(
+    public async Task<T> SendAPIRequest<T>(
         Uri uri,
         HttpMethod method,
         IDictionary<string, string> parameters = null,
@@ -128,6 +135,11 @@ namespace SpotifyAPI.Web.Http
       _jsonSerializer.SerializeRequest(request);
       await _authenticator.Apply(request).ConfigureAwait(false);
       IResponse response = await _httpClient.DoRequest(request).ConfigureAwait(false);
+      response = await _retryHandler?.HandleRetry(request, response, async (newRequest) =>
+      {
+        await _authenticator.Apply(newRequest).ConfigureAwait(false);
+        return await _httpClient.DoRequest(request).ConfigureAwait(false);
+      });
       ProcessErrors(response);
 
       IAPIResponse<T> apiResponse = _jsonSerializer.DeserializeResponse<T>(response);

SpotifyAPI.Web/Http/Interfaces/IAPIConnector.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Net.Http;
 using System.Threading.Tasks;
 
 namespace SpotifyAPI.Web.Http
@@ -27,6 +28,8 @@ namespace SpotifyAPI.Web.Http
     Task<T> Delete<T>(Uri uri, IDictionary<string, string> parameters);
     Task<T> Delete<T>(Uri uri, IDictionary<string, string> parameters, object body);
 
+    Task<T> SendAPIRequest<T>(Uri uri, HttpMethod method, IDictionary<string, string> parameters = null, object body = null);
+
     void SetRequestTimeout(TimeSpan timeout);
   }
 }

SpotifyAPI.Web/Http/Interfaces/IRetryHandler.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Threading.Tasks;
+
+namespace SpotifyAPI.Web.Http
+{
+  /// <summary>
+  ///   The Retry Handler will be directly called after the response is retrived and before errors and body are processed.
+  /// </summary>
+  public interface IRetryHandler
+  {
+    Task<IResponse> HandleRetry(IRequest request, IResponse response, Func<IRequest, Task<IResponse>> retry);
+  }
+}

SpotifyAPI.Web/Util.cs

@@ -1,41 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Globalization;
-using System.Linq;
-
-namespace SpotifyAPI.Web
-{
-  public static class Util
-  {
-    public static string GetStringAttribute<T>(this T en, string separator = "") where T : struct, IConvertible
-    {
-      Enum e = (Enum) (object) en;
-      IEnumerable<StringAttribute> attributes =
-        Enum.GetValues(typeof(T))
-        .Cast<T>()
-        .Where(v => e.HasFlag((Enum) (object) v))
-        .Select(v => typeof(T).GetField(v.ToString(CultureInfo.InvariantCulture)))
-        .Select(f => f.GetCustomAttributes(typeof(StringAttribute), false) [0])
-        .Cast<StringAttribute>();
-
-      List<string> list = new List<string>();
-      attributes.ToList().ForEach(element => list.Add(element.Text));
-      return string.Join(separator, list);
-    }
-
-    public static long ToUnixTimeMillisecondsPoly(this DateTime time)
-    {
-      return (long) time.Subtract(new DateTime(1970, 1, 1)).TotalMilliseconds;
-    }
-  }
-
-  public sealed class StringAttribute : Attribute
-  {
-    public string Text { get; set; }
-
-    public StringAttribute(string text)
-    {
-      Text = text;
-    }
-  }
-}