// Copyright (C) 2017 Space Monkey, Inc.
//
// 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 httpsig

import "fmt"

// MemoryKeyStore is a simple in memory key store that implement the
// KeyGetter interface
type MemoryKeyStore struct {
	keys map[string]interface{}
}

// NewMemoryKeyStore creates a new MemoryKeyStore
func NewMemoryKeyStore() *MemoryKeyStore {
	return &MemoryKeyStore{
		keys: make(map[string]interface{}),
	}
}

// GetKey implements KeyGetter interface
func (m *MemoryKeyStore) GetKey(id string) (interface{}, error) {
	pk, ok := m.keys[id]
	if !ok {
		return nil, fmt.Errorf("key not found")
	}
	return pk, nil
}

// SetKey link id to a key
func (m *MemoryKeyStore) SetKey(id string, key interface{}) {
	m.keys[id] = key
}