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whisper.go
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whisper.go
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// Copyright © 2018 Joseph Wright <joseph@cloudboss.co>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package whisper
import (
"fmt"
"strings"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/ssm"
"github.com/aws/aws-sdk-go/service/ssm/ssmiface"
"github.com/cloudboss/keights/pkg/helpers"
)
func getSecret(ssmClient ssmiface.SSMAPI, path string) (*string, error) {
withDecryption := true
response, err := ssmClient.GetParameters(&ssm.GetParametersInput{
Names: []*string{&path},
WithDecryption: &withDecryption,
})
if err != nil {
return nil, err
}
for _, parameter := range response.Parameters {
return parameter.Value, nil
}
return nil, fmt.Errorf("Secret %s not found", path)
}
func getSecrets(ssmClient ssmiface.SSMAPI, pathSpecs []map[string]string) ([]map[string]*string, error) {
maps := []map[string]*string{}
for _, pathSpec := range pathSpecs {
secret, err := getSecret(ssmClient, pathSpec["path"])
if err != nil {
return nil, err
}
maps = append(maps, map[string]*string{
"secret": secret, "dest": aws.String(pathSpec["dest"]),
})
}
return maps, nil
}
func writeSecrets(secretSpecs []map[string]*string) error {
for _, secretSpec := range secretSpecs {
err := helpers.WriteIfChanged(*secretSpec["dest"], []byte(*secretSpec["secret"]), 0400)
if err != nil {
return err
}
}
return nil
}
func parsePaths(paths []string) ([]map[string]string, error) {
maps := []map[string]string{}
for _, path := range paths {
parts := strings.Split(path, ":")
if len(parts) != 2 {
return nil, fmt.Errorf("Malformed path %s", path)
}
maps = append(maps, map[string]string{"path": parts[0], "dest": parts[1]})
}
return maps, nil
}
func DoIt(paths []string) error {
sess, err := session.NewSession()
if err != nil {
return err
}
ssmClient := ssm.New(sess)
pathSpecs, err := parsePaths(paths)
if err != nil {
return err
}
secretSpecs, err := getSecrets(ssmClient, pathSpecs)
if err != nil {
return err
}
return writeSecrets(secretSpecs)
}