Initial models for supporting client-go credential plugins

#108

src/KubeClient.Extensions.KubeConfig/Models/AuthPluginConfig.cs

@@ -0,0 +1,53 @@
+using System.Collections.Generic;
+using KubeClient.Models;
+using YamlDotNet.Serialization;
+
+namespace KubeClient.Extensions.KubeConfig.Models
+{
+    /// <summary>
+    ///     Configuration for a K8s client-go credential plugin.
+    /// </summary>
+    public class CredentialPluginConfig
+    {
+        /// <summary>
+        ///     The plugin command.
+        /// </summary>
+        [YamlMember(Alias = "command")]
+        public string Command { get; set; }
+
+        /// <summary>
+        ///     The API version to use when decoding the ExecCredentials resource.
+        /// </summary>
+        /// <remarks>
+        ///     The API version returned by the plugin MUST match the version specified here.
+        /// </remarks>
+        [YamlMember(Alias = "apiVersion")]
+        public string ApiVersion { get; set; }
+
+        /// <summary>
+        ///     Environment variables (if any) to set when running the plugin command.
+        /// </summary>
+        public List<EnvVarV1> EnvironmentVariables { get; } = new List<EnvVarV1>();
+
+        /// <summary>
+        ///     Should <see cref="EnvironmentVariables"/> be serialised?
+        /// </summary>
+        /// <returns>
+        ///     <c>true</c>, if <see cref="EnvironmentVariables"/> should be serialised; otherwise, <c>false</c>.
+        /// </returns>
+        public bool ShouldSerializeEnvironmentVariables() => EnvironmentVariables.Count > 0;
+
+        /// <summary>
+        ///     Command-line arguments (if any) to pass to the plugin command.
+        /// </summary>
+        public List<string> Arguments { get; } = new List<string>();
+
+        /// <summary>
+        ///     Should <see cref="Arguments"/> be serialised?
+        /// </summary>
+        /// <returns>
+        ///     <c>true</c>, if <see cref="Arguments"/> should be serialised; otherwise, <c>false</c>.
+        /// </returns>
+        public bool ShouldSerializeArguments() => Arguments.Count > 0;
+    }
+}

src/KubeClient.Extensions.KubeConfig/Models/UserIdentityConfig.cs

@@ -23,6 +23,12 @@ public class UserIdentityConfig
         [YamlMember(Alias = "auth-provider")]
         public AuthProviderConfig AuthProvider { get; set; }
 
+        /// <summary>
+        ///     Optional configuration for a client-go credential plugin.
+        /// </summary>
+        [YamlMember(Alias = "exec")]
+        public CredentialPluginConfig Exec { get; set; }
+
         /// <summary>
         ///     A file containing the PEM-encoded client certificate to use.
         /// </summary>

src/KubeClient/Models/ExecCredentialV1Beta1.cs

@@ -0,0 +1,46 @@
+using System.Collections.Generic;
+
+namespace KubeClient.Models
+{
+    /// <summary>
+    ///     The model for the response returned by client-go credential plugins.
+    /// </summary>
+    [KubeObject("ExecCredential", "client.authentication.k8s.io/v1beta1")]
+    public class ExecCredentialV1Beta1
+        : KubeObjectV1
+    {
+        /// <summary>
+        ///     Create a new <see cref="ExecCredentialV1Beta1"/>.
+        /// </summary>
+        public ExecCredentialV1Beta1()
+        {
+        }
+
+        /// <summary>
+        ///     The credential plugin's status.
+        /// </summary>
+        public Dictionary<string, object> Status { get; } = new Dictionary<string, object>();
+
+        /// <summary>
+        ///     Determine whether the credential status should be serialised.
+        /// </summary>
+        /// <returns>
+        ///     <c>true</c>, if the credential status should be serialised; otherwise, <c>false</c>.
+        /// </returns>
+        public bool ShouldSerializeStatus() => Status.Count > 0;
+
+        /// <summary>
+        ///     Get the value of the "status/token" field (if present).
+        /// </summary>
+        /// <returns>
+        ///     The token, or <c>null</c> if the field is not present.
+        /// </returns>
+        public string GetToken()
+        {
+            if (Status.TryGetValue("token", out object token))
+                return token as string;
+
+            return null;
+        }
+    }
+}