Cloud Foundry-specific Configuration

This change adds default app-agent-config.xml file that excludes VCAP_*
environment variables by default.  This protects users in Cloud Foundry
environments from exposing credentials from places like VCAP_SERVICES.

[#684]

Signed-off-by: Ben Hale <[email protected]>

Author: pavankrish123

lib/java_buildpack/framework/app_dynamics_agent.rb

@@ -28,6 +28,13 @@ class AppDynamicsAgent < JavaBuildpack::Component::VersionedDependencyComponent
       # (see JavaBuildpack::Component::BaseComponent#compile)
       def compile
         download_zip(false, @droplet.sandbox, 'AppDynamics Agent')
+        
+        # acessor for resources dir through @droplet? 
+        resources_dir = Pathname.new(File.expand_path('../../../resources', __dir__)).freeze
+        default_conf_dir = resources_dir + @droplet.component_id + 'defaults'
+        
+        copy_appd_default_configuration(default_conf_dir)
+        
         @droplet.copy_resources
       end
 
@@ -104,6 +111,18 @@ def tier_name(java_opts, credentials)
         java_opts.add_system_property('appdynamics.agent.tierName', name.to_s)
       end
 
+      # Copy default configuration present in resources folder of app_dynamics_agent ver* directories present in sandbox
+      #
+      # @param [Pathname] default_conf_dir the 'defaults' directory present in app_dynamics_agent resources.
+      # @return [Void]
+      def copy_appd_default_configuration(default_conf_dir)
+        if default_conf_dir.exist?
+          Dir.glob(@droplet.sandbox + 'ver*') do |target_directory|
+            FileUtils.cp_r"#{default_conf_dir}/.", target_directory
+          end  
+        end
+      end
+
     end
 
   end