Merge branch '815-offline-config' into main

Signed-off-by: Ben Hale <bhale@vmware.com>

lib/java_buildpack/framework/app_dynamics_agent.rb

@@ -171,20 +171,24 @@ def check_if_resource_exists(resource_uri, conf_file)
       def override_default_config_if_applicable
         return unless @application.environment['APPD_CONF_HTTP_URL']
 
-        agent_root = @application.environment['APPD_CONF_HTTP_URL'].chomp('/') + '/java/'
-        @logger.info { "Downloading override configuration files from #{agent_root}" }
-        CONFIG_FILES.each do |conf_file|
-          uri = URI(agent_root + conf_file)
-
-          # `download()` uses retries with exponential backoff which is expensive
-          # for situations like 404 File not Found. Also, `download()` doesn't expose
-          # an api to disable retries, which makes this check necessary to prevent
-          # long install times.
-          next unless check_if_resource_exists(uri, conf_file)
-
-          download(false, uri.to_s) do |file|
-            Dir.glob(@droplet.sandbox + 'ver*') do |target_directory|
-              FileUtils.cp_r file, target_directory + '/conf/' + conf_file
+        JavaBuildpack::Util::Cache::InternetAvailability.instance.available(
+          true, 'The AppDynamics remote configuration download location is always accessible'
+        ) do
+          agent_root = @application.environment['APPD_CONF_HTTP_URL'].chomp('/') + '/java/'
+          @logger.info { "Downloading override configuration files from #{agent_root}" }
+          CONFIG_FILES.each do |conf_file|
+            uri = URI(agent_root + conf_file)
+
+            # `download()` uses retries with exponential backoff which is expensive
+            # for situations like 404 File not Found. Also, `download()` doesn't expose
+            # an api to disable retries, which makes this check necessary to prevent
+            # long install times.
+            next unless check_if_resource_exists(uri, conf_file)
+
+            download(false, uri.to_s) do |file|
+              Dir.glob(@droplet.sandbox + 'ver*') do |target_directory|
+                FileUtils.cp_r file, target_directory + '/conf/' + conf_file
+              end
             end
           end
         end