Fix PKCE clientSecret issue

Author: tylerlong

RingCentral.Net/RestClient.cs

@@ -69,13 +69,21 @@ public async Task<HttpResponseMessage> Request(HttpRequestMessage httpRequestMes
         {
             restRequestConfig = restRequestConfig ?? RestRequestConfig.DefaultInstance;
 
-            httpRequestMessage.Headers.Add("X-User-Agent", $"{appName}/{appVersion} RingCentral.Net/6.2.0");
-            httpRequestMessage.Headers.Authorization =
-                BasicAuthPaths.Contains(httpRequestMessage.RequestUri.AbsolutePath)
-                    ? new AuthenticationHeaderValue("Basic",
+            httpRequestMessage.Headers.Add("X-User-Agent", $"{appName}/{appVersion} RingCentral.Net/6.2.1");
+            if (BasicAuthPaths.Contains(httpRequestMessage.RequestUri.AbsolutePath))
+            {
+                if (clientSecret != default(string))
+                {
+                    httpRequestMessage.Headers.Authorization = new AuthenticationHeaderValue("Basic",
                         Convert.ToBase64String(
-                            Encoding.UTF8.GetBytes($"{clientId}:{clientSecret}")))
-                    : new AuthenticationHeaderValue("Bearer", token.access_token);
+                            Encoding.UTF8.GetBytes($"{clientId}:{clientSecret}")));
+                }
+                // else: PKCE doesn't require a clientSecret
+            }
+            else
+            {
+                httpRequestMessage.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token.access_token);
+            }
 
             var httpResponseMessage =
                 await httpClient.SendAsync(httpRequestMessage, restRequestConfig.cancellationToken);

RingCentral.Net/RingCentral.Net.csproj

@@ -3,17 +3,22 @@
     <PropertyGroup>
         <TargetFramework>netstandard2.0</TargetFramework>
         <PackageId>RingCentral.Net</PackageId>
-        <PackageVersion>6.2.0</PackageVersion>
+        <PackageVersion>6.2.1</PackageVersion>
         <Authors>Tyler Liu ([email protected])</Authors>
         <Description>RingCentral SDK for .NET</Description>
         <PackageLicenseExpression>MIT</PackageLicenseExpression>
         <PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>
         <PackageTags>RingCentral</PackageTags>
         <RootNamespace>RingCentral</RootNamespace>
+        <PackageReadmeFile>README.md</PackageReadmeFile>
     </PropertyGroup>
 
     <ItemGroup>
         <PackageReference Include="Microsoft.AspNet.WebApi.Client" Version="6.0.0"/>
+        <None Include="../README.md">
+          <Pack>True</Pack>
+          <PackagePath>README.md</PackagePath>
+        </None>
     </ItemGroup>
 
 </Project>