From 9d59f0062afb2293664c0553b1555fef8d662f29 Mon Sep 17 00:00:00 2001
From: Amanda Tarafa Mas <atarafamas@google.com>
Date: Thu, 26 Oct 2023 23:51:27 -0700
Subject: [PATCH] feat: Check BIOS for GCE residency on Windows.

---
 .../Google.Apis.Auth/Google.Apis.Auth.csproj  |  2 ++
 .../OAuth2/ComputeCredential.cs               | 25 +++++++++++++++++--
 2 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/Src/Support/Google.Apis.Auth/Google.Apis.Auth.csproj b/Src/Support/Google.Apis.Auth/Google.Apis.Auth.csproj
index 75b2cc61ff0..7da2bfdd325 100644
--- a/Src/Support/Google.Apis.Auth/Google.Apis.Auth.csproj
+++ b/Src/Support/Google.Apis.Auth/Google.Apis.Auth.csproj
@@ -40,6 +40,7 @@ Supported Platforms:
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)'=='netstandard2.0'">
+    <PackageReference Include="System.Management" Version="7.0.2" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)'=='net45'">
@@ -48,6 +49,7 @@ Supported Platforms:
 
   <ItemGroup Condition="'$(TargetFramework)'=='net461'">
     <Reference Include="System.Net.Http" />
+    <PackageReference Include="System.Management" Version="7.0.2" />
   </ItemGroup>
 
   <!-- build and include the (empty) platformservices dll in package; required for binary backward compatibility -->
diff --git a/Src/Support/Google.Apis.Auth/OAuth2/ComputeCredential.cs b/Src/Support/Google.Apis.Auth/OAuth2/ComputeCredential.cs
index 257868e3968..09a39fb0e2f 100644
--- a/Src/Support/Google.Apis.Auth/OAuth2/ComputeCredential.cs
+++ b/Src/Support/Google.Apis.Auth/OAuth2/ComputeCredential.cs
@@ -21,6 +21,7 @@ limitations under the License.
 using Newtonsoft.Json;
 using System;
 using System.Collections.Generic;
+using System.ComponentModel;
 using System.IO;
 using System.Linq;
 using System.Net;
@@ -398,12 +399,32 @@ bool IsLinux()
 #endif
             }
 
-            bool IsWindowsGoogleBios() => throw new NotImplementedException();
+            bool IsWindowsGoogleBios()
+            {
+                Logger.Info("Checking BIOS values on Windows.");
+#if NET45 || NETSTANDARD1_3
+                Logger.Debug("System.Management is not supported in net45 and netstandard1.3");
+                return false;
+#else
+                System.Management.ManagementClass biosClass = new ("Win32_BIOS");
+                using var instances = biosClass.GetInstances();
+
+                foreach(var instance in instances) using (instance)
+                {
+                    // We should only find one instance for Win32_BIOS class.
+                    // This will throw a ManagementException "NotFound" if the "Manufacturer" property
+                    // is not present. That's fine, we are catching the exception elsewhere and logging it.
+                    return instance["Manufacturer"]?.ToString() == "Google";
+                }
+                Logger.Debug("No Win32_BIOS management object found.");
+                return false;
+#endif
+            }
 
             async Task<bool> IsLinuxGoogleBiosAsync()
             {
                 Logger.Info("Checking BIOS values on Linux.");
-                
+
                 string fileName = "/sys/class/dmi/id/product_name";
                 if (!File.Exists(fileName))
                 {