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ecv.go
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ecv.go
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// Copyright (c) 2018 Palantir Technologies. 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 witchcraft
import (
"io/ioutil"
"os"
"github.com/palantir/go-encrypted-config-value/encryptedconfigvalue"
"github.com/palantir/witchcraft-go-error"
)
type ECVKeyProvider interface {
Load() (*encryptedconfigvalue.KeyWithType, error)
}
type ecvKeyProvider func() (*encryptedconfigvalue.KeyWithType, error)
func (p ecvKeyProvider) Load() (*encryptedconfigvalue.KeyWithType, error) {
return p()
}
func ECVKeyNoOp() ECVKeyProvider {
return ECVKeyFromStatic(nil)
}
func ECVKeyFromStatic(kwt *encryptedconfigvalue.KeyWithType) ECVKeyProvider {
return ecvKeyProvider(func() (*encryptedconfigvalue.KeyWithType, error) {
return kwt, nil
})
}
func ECVKeyFromFile(path string) ECVKeyProvider {
return ecvKeyProvider(func() (*encryptedconfigvalue.KeyWithType, error) {
keyBytes, err := ioutil.ReadFile(path)
if err != nil {
if os.IsNotExist(err) {
return nil, werror.Wrap(err, "encryption key file does not exist", werror.SafeParam("path", path))
}
return nil, werror.Wrap(err, "failed to read encryption key file", werror.SafeParam("path", path))
}
kwt, err := encryptedconfigvalue.NewKeyWithType(string(keyBytes))
if err != nil {
return nil, werror.Wrap(err, "failed to create key with type")
}
return &kwt, nil
})
}