Add support to WebAPI for a consumer-supplied dictionary of arguments

SteamKit2/SteamKit2/Steam/WebAPI/WebAPI.cs

@@ -366,21 +366,29 @@ public void Dispose()
             /// </exception>
             public override bool TryInvokeMember( InvokeMemberBinder binder, object[] args, out object result )
             {
-                if ( binder.CallInfo.ArgumentNames.Count != args.Length )
+                IDictionary<string, object> methodArgs;
+
+                if ( args.Length == 1 && binder.CallInfo.ArgumentNames.Count == 0 && args[ 0 ] is IDictionary<string, object> explicitArgs )
+                {
+                    methodArgs = explicitArgs;
+                }
+                else if ( binder.CallInfo.ArgumentNames.Count != args.Length )
                 {
-                    throw new InvalidOperationException( "Argument mismatch in API call. All parameters must be passed as named arguments." );
+                    throw new InvalidOperationException( "Argument mismatch in API call. All parameters must be passed as named arguments, or as a single un-named dictionary argument." );
+                }
+                else
+                {
+                    methodArgs = Enumerable.Range( 0, args.Length )
+                        .ToDictionary( 
+                            x => binder.CallInfo.ArgumentNames[ x ],
+                            x => args[ x ] );
                 }
 
                 var apiArgs = new Dictionary<string, object>();
-
                 var requestMethod = HttpMethod.Get;
 
-                // convert named arguments into key value pairs
-                for ( int x = 0 ; x < args.Length ; x++ )
+                foreach ( var ( argName, argValue ) in methodArgs )
                 {
-                    string argName = binder.CallInfo.ArgumentNames[ x ];
-                    object argValue = args[ x ];
-
                     // method is a reserved param for selecting the http request method
                     if ( argName.Equals( "method", StringComparison.OrdinalIgnoreCase ) )
                     {
@@ -391,11 +399,11 @@ public override bool TryInvokeMember( InvokeMemberBinder binder, object[] args,
                     else if ( argValue is IEnumerable && !( argValue is string ) )
                     {
                         int index = 0;
-                        IEnumerable enumerable = argValue as IEnumerable;
+                        var enumerable = argValue as IEnumerable;
 
                         foreach ( object value in enumerable )
                         {
-                            apiArgs.Add( String.Format( "{0}[{1}]", argName, index++ ), value );
+                            apiArgs.Add( string.Format( "{0}[{1}]", argName, index++ ), value );
                         }
 
                         continue;

SteamKit2/SteamKit2/Util/KeyValuePairExtensions.cs

@@ -0,0 +1,13 @@
+using System.Collections.Generic;
+
+namespace SteamKit2
+{
+    static class KeyValuePairExtensions
+    {
+        public static void Deconstruct<TKey, TValue>(this KeyValuePair<TKey, TValue> kvp, out TKey key, out TValue value)
+        {
+            key = kvp.Key;
+            value = kvp.Value;
+        }
+    }
+}

SteamKit2/Tests/Tests.csproj

@@ -7,6 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="Microsoft.AspNet.WebApi.Client" Version="5.2.7" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.0.0" />
     <PackageReference Include="xunit" Version="2.2.0" />
     <PackageReference Include="xunit.analyzers" Version="0.10.0" />

SteamKit2/Tests/WebAPIFacts.cs

@@ -1,8 +1,8 @@
 using System;
-using System.IO;
+using System.Collections.Generic;
 using System.Net;
 using System.Net.Http;
-using System.Net.Sockets;
+using System.Threading;
 using System.Threading.Tasks;
 using SteamKit2;
 using Xunit;
@@ -44,56 +44,59 @@ public void SteamConfigWebAPIInterface()
         [Fact]
         public async Task ThrowsWebAPIRequestExceptionIfRequestUnsuccessful()
         {
-            var listener = new TcpListener(new IPEndPoint(IPAddress.Loopback, 28123));
-            listener.Start();
-            try
-            {
-                AcceptAndAutoReplyNextSocket(listener);
+            var configuration = SteamConfiguration.Create( c => c.WithHttpClientFactory( () => new HttpClient( new ServiceUnavailableHttpMessageHandler() ) ) );
+            dynamic iface = configuration.GetAsyncWebAPIInterface( "IFooService" ); 
 
-                var baseUri = "http://localhost:28123";
-                dynamic iface = WebAPI.GetAsyncInterface(new Uri(baseUri), "IFooService");
+           await Assert.ThrowsAsync<WebAPIRequestException>(() => (Task)iface.PerformFooOperation());
+        }
 
-                await Assert.ThrowsAsync<WebAPIRequestException>(() => (Task)iface.PerformFooOperation());
-            }
-            finally
+        [Fact]
+        public async Task UsesSingleParameterArgumentsDictionary()
+        {
+            var capturingHandler = new CaturingHttpMessageHandler();
+            var configuration = SteamConfiguration.Create( c => c.WithHttpClientFactory( () => new HttpClient( capturingHandler ) ) );
+
+            dynamic iface = configuration.GetAsyncWebAPIInterface( "IFooService" );
+
+            var args = new Dictionary<string, object>
             {
-                listener.Stop();
-            }
+                [ "f" ] = "foo",
+                [ "b" ] = "bar",
+                [ "method" ] = "PUT"
+            };
+
+            var response = await iface.PerformFooOperation2( args );
+
+            var request = capturingHandler.MostRecentRequest;
+            Assert.NotNull( request );
+            Assert.Equal( "/IFooService/PerformFooOperation/v2", request.RequestUri.AbsolutePath );
+            Assert.Equal( HttpMethod.Put, request.Method );
+
+            var formData = await request.Content.ReadAsFormDataAsync();
+            Assert.Equal( 3, formData.Count );
+            Assert.Equal( "foo", formData[ "f" ] );
+            Assert.Equal( "bar", formData[ "b" ] );
+            Assert.Equal( "vdf", formData[ "format" ] );
         }
 
-        // Primitive HTTP listener function that always returns HTTP 503.
-        static void AcceptAndAutoReplyNextSocket(TcpListener listener)
+        sealed class ServiceUnavailableHttpMessageHandler : HttpMessageHandler
         {
-            void OnSocketAccepted(IAsyncResult result)
-            {
-                try
-                {
-                    using (var socket = listener.EndAcceptSocket(result))
-                    using (var stream = new NetworkStream(socket))
-                    using (var reader = new StreamReader(stream))
-                    using (var writer = new StreamWriter(stream))
-                    {
-                        string line;
-                        do
-                        {
-                            line = reader.ReadLine();
-                        }
-                        while (!string.IsNullOrEmpty(line));
-
-                        writer.WriteLine("HTTP/1.1 503 Service Unavailable");
-                        writer.WriteLine("X-Response-Source: Unit Test");
-                        writer.WriteLine();
-                    }
-                }
-                catch
-                {
-                }
-            }
+            protected override Task<HttpResponseMessage> SendAsync( HttpRequestMessage request, CancellationToken cancellationToken )
+                => Task.FromResult( new HttpResponseMessage( HttpStatusCode.ServiceUnavailable ) );
+        }
+
+        sealed class CaturingHttpMessageHandler : HttpMessageHandler
+        {
+            public HttpRequestMessage MostRecentRequest { get; private set; }
 
-            var ar = listener.BeginAcceptSocket(OnSocketAccepted, null);
-            if (ar.CompletedSynchronously)
+            protected override Task<HttpResponseMessage> SendAsync( HttpRequestMessage request, CancellationToken cancellationToken )
             {
-                OnSocketAccepted(ar);
+                MostRecentRequest = request;
+
+                return Task.FromResult( new HttpResponseMessage( HttpStatusCode.OK )
+                {
+                    Content = new ByteArrayContent( Array.Empty<byte>() )
+                });
             }
         }
     }