Add Platform.IsCloudFoundry property to check for VCAP_APPLICATION

src/Steeltoe.Common/Platform.cs

@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+using System;
 using System.Runtime.InteropServices;
 
 namespace Steeltoe.Common
@@ -20,9 +21,12 @@ namespace Steeltoe.Common
     {
         public const string NET_FRAMEWORK = ".NET Framework";
         public const string NET_CORE = ".NET Core";
+        public const string VCAP_APPLICATION = "VCAP_APPLICATION";
 
         public static bool IsFullFramework => RuntimeInformation.FrameworkDescription.StartsWith(NET_FRAMEWORK);
 
         public static bool IsNetCore => RuntimeInformation.FrameworkDescription.StartsWith(NET_CORE);
+
+        public static bool IsCloudFoundry => Environment.GetEnvironmentVariable(VCAP_APPLICATION) != null;
     }
 }

test/Steeltoe.Common.Test/PlatformTest.cs

@@ -0,0 +1,32 @@
+// Copyright 2017 the original author or authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+using System;
+using Xunit;
+
+namespace Steeltoe.Common.Test
+{
+    public class PlatformTest
+    {
+        [Fact]
+        public void IsCloudFoundry_ReturnsExpected()
+        {
+            Assert.False(Platform.IsCloudFoundry);
+            Environment.SetEnvironmentVariable("VCAP_APPLICATION", "somevalue");
+            Assert.True(Platform.IsCloudFoundry);
+            Environment.SetEnvironmentVariable("VCAP_APPLICATION", null);
+            Assert.False(Platform.IsCloudFoundry);
+        }
+    }
+}