Add Request Filters support

Author: sandorfr

src/GeekLearning.RestKit.Core/ClientBase.cs

@@ -8,11 +8,12 @@
 namespace GeekLearning.RestKit.Core
 {
     public abstract class ClientBase<TOptions>
-       where TOptions : class, new()
+       where TOptions : class, IProvideRequestFilters, new()
     {
         private IMediaFormatterProvider mediaFormatterProvider;
 
-        public ClientBase(IOptions<TOptions> options, IMediaFormatterProvider mediaFormatterProvider)
+        public ClientBase(IOptions<TOptions> options,
+            IMediaFormatterProvider mediaFormatterProvider)
         {
             this.Options = options.Value;
             this.mediaFormatterProvider = mediaFormatterProvider;
@@ -30,6 +31,17 @@ protected Task<TTarget> TransformResponseAsync<TTarget>(HttpResponseMessage mess
             return mediaFormatter.TransformAsync<TTarget>(message.Content);
         }
 
+        protected HttpRequestMessage ApplyFilters(HttpRequestMessage requestMessage, params string[] securityDefinitions)
+        {
+            HttpRequestMessage finalMessage = requestMessage;
+            foreach (var filter in this.Options.RequestFilters)
+            {
+                finalMessage = filter.Apply(requestMessage, securityDefinitions) ?? finalMessage;
+            }
+
+            return finalMessage;
+        }
+
         protected HttpContent TransformRequestBody(object data, string mediaType)
         {
             IMediaFormatter mediaFormatter = this.mediaFormatterProvider.GetMediaFormatter(mediaType);

src/GeekLearning.RestKit.Core/ClientOptionsBase.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace GeekLearning.RestKit.Core
+{
+    public abstract class ClientOptionsBase : IProvideRequestFilters
+    {
+        private List<IRequestFilter> requestfilters = new List<IRequestFilter>();
+
+        public void AddFilter(IRequestFilter filter)
+        {
+            this.requestfilters.Add(filter);
+        }
+
+        public IEnumerable<IRequestFilter> RequestFilters
+        {
+            get
+            {
+                return requestfilters;
+            }
+        }
+    }
+}

src/GeekLearning.RestKit.Core/IProvideRequestFilters.cs

@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace GeekLearning.RestKit.Core
+{
+    public interface IProvideRequestFilters
+    {
+        IEnumerable<IRequestFilter> RequestFilters { get; }
+    }
+}

src/GeekLearning.RestKit.Core/IRequestFilter.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Http;
+using System.Threading.Tasks;
+
+namespace GeekLearning.RestKit.Core
+{
+    public interface IRequestFilter
+    {
+        HttpRequestMessage Apply(HttpRequestMessage requestMessage, string[] securityDefinitions);
+    }
+}