You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: config.go
    path of file: ./repos/kubeedge/vendor/k8s.io/apiserver/pkg/admission
    
    the code of the file until where you have to start completion: /*
Copyright 2017 The Kubernetes 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
    
func GetAdmissionPluginConfigurationFor(pluginCfg apiserver.AdmissionPluginConfiguration) (io.Reader, error) {
	// if there is a nest object, return it directly
	if pluginCfg.Configuration != nil {
		return bytes.NewBuffer(pluginCfg.Configuration.Raw), nil
	}
	// there is nothing nested, so we delegate to path
	if pluginCfg.Path != "" {
		content, err := ioutil.ReadFile(pluginCfg.Path)
		if err != nil {
			klog.Fatalf("Couldn't open admission plugin configuration %s: %#v", pluginCfg.Path, err)
			return nil, err
		}
		return bytes.NewBuffer(content), nil
	}
	// there is no special config at all
	return nil, nil
}