chore: Simplify integration of the library

src/Docker.DotNet.X509/CertificateCredentials.cs

@@ -18,31 +18,38 @@ public HttpMessageHandler ConfigureHandler(HttpMessageHandler handler)
 #if NET6_0_OR_GREATER
         if (handler is SocketsHttpHandler socketsHandler)
         {
-            socketsHandler.SslOptions.ClientCertificates = new X509Certificate2Collection();
-            socketsHandler.SslOptions.ClientCertificates.Add(_certificate);
+            if (_certificate != null)
+            {
+                socketsHandler.SslOptions.ClientCertificates = new X509Certificate2Collection();
+                socketsHandler.SslOptions.ClientCertificates.Add(_certificate);
+            }
+
             socketsHandler.SslOptions.RemoteCertificateValidationCallback = ServerCertificateValidationCallback;
             return socketsHandler;
         }
 #else
         if (handler is HttpClientHandler httpHandler)
         {
-            httpHandler.ClientCertificates.Add(_certificate);
+            if  (_certificate != null && !httpHandler.ClientCertificates.Contains(_certificate))
+            {
+                httpHandler.ClientCertificates.Add(_certificate);
+            }
+
             httpHandler.ServerCertificateCustomValidationCallback = (message, certificate, chain, sslPolicyErrors) => ServerCertificateValidationCallback(message, certificate, chain, sslPolicyErrors);
             return httpHandler;
         }
 #endif
-        if (handler is not ManagedHandler managedHandler)
+        if (handler is ManagedHandler managedHandler)
         {
-            return handler;
-        }
+            if  (_certificate != null && !managedHandler.ClientCertificates.Contains(_certificate))
+            {
+                managedHandler.ClientCertificates.Add(_certificate);
+            }
 
-        if (!managedHandler.ClientCertificates.Contains(_certificate))
-        {
-            managedHandler.ClientCertificates.Add(_certificate);
+            managedHandler.ServerCertificateValidationCallback = ServerCertificateValidationCallback;
+            return managedHandler;
         }
 
-        managedHandler.ServerCertificateValidationCallback = ServerCertificateValidationCallback;
-
         return handler;
     }
 }

src/Docker.DotNet/DockerClient.cs

@@ -26,6 +26,7 @@ internal DockerClient(
         _clientOptions = clientOptions;
         _hijack = hijack;
 
+        Options = clientOptions;
         System = new SystemOperations(this);
         Containers = new ContainerOperations(this);
         Images = new ImageOperations(this);
@@ -39,6 +40,8 @@ internal DockerClient(
         Exec = new ExecOperations(this);
     }
 
+    public ClientOptions Options { get; }
+
     public ISystemOperations System { get; }
 
     public IContainerOperations Containers { get; }

src/Docker.DotNet/DockerClientBuilder.cs

@@ -37,7 +37,7 @@ public DockerClientBuilder()
     /// </summary>
     /// <param name="version">The requested API version.</param>
     /// <returns>The builder instance.</returns>
-    public DockerClientBuilder WithApiVersion(Version version)
+    public DockerClientBuilder WithApiVersion(Version? version)
     {
         ClientOptions = ClientOptions with { ApiVersion = version };
         return this;
@@ -59,9 +59,11 @@ public DockerClientBuilder WithEndpoint(Uri endpoint)
     /// </summary>
     /// <param name="authProvider">The authentication provider.</param>
     /// <returns>The builder instance.</returns>
-    public DockerClientBuilder WithAuthProvider(IAuthProvider authProvider)
+    public DockerClientBuilder WithAuthProvider(IAuthProvider? authProvider)
     {
-        ClientOptions = ClientOptions with { AuthProvider = authProvider };
+        var nonNullableAuthProvider = authProvider ?? NoopAuthProvider.Instance;
+
+        ClientOptions = ClientOptions with { AuthProvider = nonNullableAuthProvider };
         return this;
     }
 

src/Docker.DotNet/IDockerClient.cs

@@ -2,6 +2,8 @@ namespace Docker.DotNet;
 
 public interface IDockerClient : IDisposable
 {
+    ClientOptions Options { get; }
+
     ISystemOperations System { get; }
 
     IContainerOperations Containers { get; }