/
secrets.go
137 lines (110 loc) · 3.45 KB
/
secrets.go
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package run
import (
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/http"
"time"
)
var (
secretmanagerEndpoint = "https://secretmanager.googleapis.com/v1"
)
// ErrSecretPermissionDenied is returned when access to a secret is denied.
var ErrSecretPermissionDenied = errors.New("run: permission denied to named secret")
// ErrSecretUnauthorized is returned when calls to the Secret
// Manager API are unauthorized.
var ErrSecretUnauthorized = errors.New("run: secret manager unauthorized")
// ErrSecretNotFound is returned when a secret is not found.
var ErrSecretNotFound = errors.New("run: named secret not found")
// ErrSecretUnknownError is return when calls to the Secret Manager
// API return an unknown error.
var ErrSecretUnknownError = errors.New("run: unexpected error retrieving named secret")
// ErrSecretUnexpectedResponse is returned when calls to the Secret Manager
// API return an unexpected response.
type ErrSecretUnexpectedResponse struct {
StatusCode int
Err error
}
func (e *ErrSecretUnexpectedResponse) Error() string {
return "run: unexpected error retrieving named secret"
}
func (e *ErrSecretUnexpectedResponse) Unwrap() error { return e.Err }
// SecretVersion represents a Google Cloud Secret.
type SecretVersion struct {
Name string
Payload SecretPayload `json:"payload"`
}
// SecretPayload holds the secret payload for a Google Cloud Secret.
type SecretPayload struct {
// A base64-encoded string.
Data string `json:"data"`
}
func formatSecretVersion(project, name, version string) string {
return fmt.Sprintf("projects/%s/secrets/%s/versions/%s", project, name, version)
}
// AccessSecretVersion returns a Google Cloud Secret for the given
// secret name and version.
func AccessSecretVersion(name, version string) ([]byte, error) {
return accessSecretVersion(name, version)
}
// AccessSecret returns the latest version of a Google Cloud Secret
// for the given name.
func AccessSecret(name string) ([]byte, error) {
return accessSecretVersion(name, "latest")
}
func accessSecretVersion(name, version string) ([]byte, error) {
if version == "" {
version = "latest"
}
token, err := Token([]string{"https://www.googleapis.com/auth/cloud-platform"})
if err != nil {
return nil, err
}
numericProjectID, err := NumericProjectID()
if err != nil {
return nil, err
}
secretVersion := formatSecretVersion(numericProjectID, name, version)
endpoint := fmt.Sprintf("%s/%s:access", secretmanagerEndpoint, secretVersion)
request, err := http.NewRequest("GET", endpoint, nil)
if err != nil {
return nil, err
}
request.Header.Set("User-Agent", userAgent)
request.Header.Add("Authorization", fmt.Sprintf("Bearer %s", token.AccessToken))
timeout := time.Duration(5) * time.Second
httpClient := http.Client{Timeout: timeout}
response, err := httpClient.Do(request)
if err != nil {
return nil, err
}
defer response.Body.Close()
switch s := response.StatusCode; s {
case 200:
break
case 401:
return nil, ErrSecretUnauthorized
case 403:
return nil, ErrSecretPermissionDenied
case 404:
return nil, ErrSecretNotFound
default:
return nil, &ErrSecretUnexpectedResponse{s, ErrSecretUnknownError}
}
data, err := ioutil.ReadAll(response.Body)
if err != nil {
return nil, err
}
var s SecretVersion
err = json.Unmarshal(data, &s)
if err != nil {
return nil, err
}
decodedData, err := base64.StdEncoding.DecodeString(s.Payload.Data)
if err != nil {
return nil, err
}
return decodedData, nil
}