Fix issue for checking if app is running in an OCI instance which causes Instance Principal auth to fail

integrations/oci/sdk/runtime/src/main/java/io/helidon/integrations/oci/sdk/runtime/OciAvailabilityDefault.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2023 Oracle and/or its affiliates.
+ * Copyright (c) 2023, 2024 Oracle and/or its affiliates.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -28,13 +28,16 @@
 import com.oracle.bmc.Region;
 import jakarta.inject.Singleton;
 
+import static com.oracle.bmc.auth.AbstractFederationClientAuthenticationDetailsProviderBuilder.METADATA_SERVICE_BASE_URL;
+
 /**
  * This (overridable) implementation will check the {@link OciConfig} for {@code IMDS} availability. And if it is found to be
  * available, will also perform a secondary check on {@link Region#getRegionFromImds()} to ensure it returns a non-null value.
  */
 @Singleton
 @Weight(ServiceInfoBasics.DEFAULT_INJECT_WEIGHT)
 class OciAvailabilityDefault implements OciAvailability {
+    private static final String OPC_PATH = getOpcPath();
 
     @Override
     public boolean isRunningOnOci(OciConfig ociConfig) {
@@ -46,7 +49,7 @@ static boolean runningOnOci(OciConfig ociConfig) {
             return false;
         }
 
-        return (Region.getRegionFromImds() != null);
+        return (Region.getRegionFromImds("http://" + ociConfig.imdsHostName() + OPC_PATH) != null);
     }
 
     static boolean canReach(String address,
@@ -71,4 +74,15 @@ static boolean canReach(String address,
         }
     }
 
+    private static String getOpcPath() {
+        String input = METADATA_SERVICE_BASE_URL;
+        int index = -1;
+        for (int nth = 3; nth > 0; nth--) {
+            index = input.indexOf("/", index + 1);
+            if (index == -1) {
+                return null;
+            }
+        }
+        return METADATA_SERVICE_BASE_URL.substring(index);
+    }
 }