Allow token refresh for GCP (#402)

tests/KubernetesClient.Tests/GcpTokenProviderTests.cs

@@ -0,0 +1,28 @@
+using System;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+using FluentAssertions;
+using k8s.Authentication;
+using Xunit;
+
+namespace k8s.Tests
+{
+    public class GcpTokenProviderTests
+    {
+        [OperatingSystemDependentFact(Exclude = OperatingSystem.OSX)]
+        public async Task GetToken()
+        {
+            var isWindows = Environment.OSVersion.Platform == PlatformID.Win32NT;
+            var cmd = Path.Combine(Directory.GetCurrentDirectory(), "assets", isWindows ? "mock-gcloud.cmd" : "mock-gcloud.sh");
+            if (!isWindows)
+            {
+                System.Diagnostics.Process.Start("chmod", $"+x {cmd}").WaitForExit();
+            }
+            var sut = new GcpTokenProvider(cmd);
+            var result = await sut.GetAuthenticationHeaderAsync(CancellationToken.None);
+            result.Scheme.Should().Be("Bearer");
+            result.Parameter.Should().Be("ACCESS-TOKEN");
+        }
+    }
+}

tests/KubernetesClient.Tests/OperatingSystem.cs

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+using System;
+
+namespace k8s.Tests
+{
+    [Flags]
+    public enum OperatingSystem
+    {
+        Windows = 1,
+        Linux = 2,
+        OSX = 4
+    }
+}

tests/KubernetesClient.Tests/OperatingSystemFact.cs

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+using System.Runtime.InteropServices;
+using Xunit;
+
+namespace k8s.Tests
+{
+    public class OperatingSystemDependentFactAttribute : FactAttribute
+    {
+        public OperatingSystem Include { get; set; } = OperatingSystem.Linux | OperatingSystem.Windows | OperatingSystem.OSX;
+        public OperatingSystem Exclude { get; set; }
+
+        public override string Skip
+        {
+            get => IsOS(Include) && !IsOS(Exclude) ? null : "Not compatible with current OS";
+            set { }
+        }
+
+        private bool IsOS(OperatingSystem operatingSystem)
+        {
+            if (operatingSystem.HasFlag(OperatingSystem.Linux) && RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
+            {
+                return true;
+            }
+
+            if (operatingSystem.HasFlag(OperatingSystem.Windows) && RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            {
+                return true;
+            }
+
+            if (operatingSystem.HasFlag(OperatingSystem.OSX) && RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
+            {
+                return true;
+            }
+
+            return false;
+        }
+    }
+}

tests/KubernetesClient.Tests/assets/gcloud-config-helper.json

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+{
+    "configuration": {
+        "active_configuration": "default",
+        "properties": {
+            "compute": {
+                "region": "us-east1",
+                "zone": "us-east1-b"
+            },
+            "core": {
+                "account": "some@account.io",
+                "disable_usage_reporting": "True",
+                "project": "fe-astakhov"
+            }
+        }
+    },
+    "credential": {
+        "access_token": "ACCESS-TOKEN",
+        "token_expiry": "2020-03-20T07:09:20Z"
+    },
+    "sentinels": {
+        "config_sentinel": "C:\\Users\\Andrew\\AppData\\Roaming\\gcloud\\config_sentinel"
+    }
+}

tests/KubernetesClient.Tests/assets/mock-gcloud.cmd

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+@echo off
+type %~dp0\gcloud-config-helper.json

tests/KubernetesClient.Tests/assets/mock-gcloud.sh

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+#!/bin/bash
+SCRIPT=$(readlink -f "$0")
+SCRIPTPATH=$(dirname "$SCRIPT") 
+OUTPUT_JSON=$SCRIPTPATH/gcloud-config-helper.json
+cat $OUTPUT_JSON