keyprovider.go

// Copyright (c) 2017 VMware, Inc. All Rights Reserved.
//
// 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-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package config

import (
	"io/ioutil"
)

// KeyProvider provides the key used to encrypt and decrypt attrs
type KeyProvider interface {
	// Get returns the key
	// params can be used to pass parameters in different implements
	Get(params map[string]interface{}) (string, error)
}

// FileKeyProvider reads key from file
type FileKeyProvider struct {
	path string
}

// NewFileKeyProvider returns an instance of FileKeyProvider
// path: where the key should be read from
func NewFileKeyProvider(path string) KeyProvider {
	return &FileKeyProvider{
		path: path,
	}
}

// Get returns the key read from file
func (f *FileKeyProvider) Get(params map[string]interface{}) (string, error) {
	b, err := ioutil.ReadFile(f.path)
	if err != nil {
		return "", err
	}
	return string(b), nil
}