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|
//
// gokms - Go packages to interact with Amazon KMS (Key Management Service)
//
//
// Written by Kiko Hsieh <kiko_hsieh@trend.com.tw>
//
package kms
import (
"bytes"
"encoding/json"
"fmt"
"github.com/AdRoll/goamz/aws"
"io/ioutil"
"net/http"
"time"
)
const (
httpMethod = "POST"
contentType = "application/x-amz-json-1.1"
targetPrefix = "TrentService."
serverName = "kms"
)
type KMS struct {
aws.Auth
aws.Region
}
func New(auth aws.Auth, region aws.Region) *KMS {
return &KMS{auth, region}
}
func (k *KMS) query(requstInfo KMSAction) ([]byte, error) {
b, err := json.Marshal(requstInfo)
if err != nil {
return nil, err
}
hreq, err := http.NewRequest(httpMethod, k.Region.KMSEndpoint+"/", bytes.NewBuffer(b))
if err != nil {
return nil, err
}
hreq.Header.Set("Content-Type", contentType)
hreq.Header.Set("X-Amz-Date", time.Now().UTC().Format(aws.ISO8601BasicFormat))
hreq.Header.Set("X-Amz-Target", targetPrefix+requstInfo.ActionName())
if k.Auth.Token() != "" {
hreq.Header.Set("X-Amz-Security-Token", k.Auth.Token())
}
//All KMS operations require Signature Version 4
//http://docs.aws.amazon.com/kms/latest/APIReference/Welcome.html
signer := aws.NewV4Signer(k.Auth, serverName, k.Region)
signer.Sign(hreq)
r, err := http.DefaultClient.Do(hreq)
if err != nil {
return nil, err
}
body, _ := ioutil.ReadAll(r.Body)
defer r.Body.Close()
if r.StatusCode != 200 {
return nil, buildError(body, r.StatusCode)
}
return body, err
}
type KMSError struct {
StatusCode int `json:",omitempty"`
Type string `json:"__type"`
Message string `json:"message"`
}
func (k *KMSError) Error() string {
return fmt.Sprintf("Type: %s, Code: %d, Message: %s",
k.Type, k.StatusCode, k.Message,
)
}
func buildError(body []byte, statusCode int) error {
err := KMSError{StatusCode: statusCode}
json.Unmarshal(body, &err)
return &err
}
// ================== Action ========================
func (k *KMS) DescribeKey(info DescribeKeyInfo) (DescribeKeyResp, error) {
resp := DescribeKeyResp{}
bResp, err := k.query(&info)
if err != nil {
return resp, err
}
err = json.Unmarshal(bResp, &resp)
return resp, err
}
func (k *KMS) ListAliases(info ListAliasesInfo) (ListAliasesResp, error) {
resp := ListAliasesResp{}
bResp, err := k.query(&info)
if err != nil {
return resp, err
}
err = json.Unmarshal(bResp, &resp)
return resp, err
}
func (k *KMS) Encrypt(info EncryptInfo) (EncryptResp, error) {
resp := EncryptResp{}
bResp, err := k.query(&info)
if err != nil {
return resp, err
}
err = json.Unmarshal(bResp, &resp)
return resp, err
}
func (k *KMS) Decrypt(info DecryptInfo) (DecryptResp, error) {
resp := DecryptResp{}
bResp, err := k.query(&info)
if err != nil {
return resp, err
}
err = json.Unmarshal(bResp, &resp)
return resp, err
}
func (k *KMS) EnableKey(info EnableKeyInfo) error {
_, err := k.query(&info)
return err
}
func (k *KMS) DisableKey(info DisableKeyInfo) error {
_, err := k.query(&info)
return err
}
|
