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auth.go
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auth.go
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// Copyright 2015 Google Inc. 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.
// This package provides authentication utilities for Google Compute Engine (GCE)
package gce
import (
"encoding/json"
"fmt"
"strings"
"github.com/GoogleCloudPlatform/gcloud-golang/compute/metadata"
)
type AuthToken struct {
// The actual token.
AccessToken string `json:"access_token"`
// Number of seconds in which the token will expire
ExpiresIn int `json:"expires_in"`
// Type of token.
TokenType string `json:"token_type"`
}
// Checks that the required auth scope is present.
func VerifyAuthScope(expectedScope string) error {
scopes, err := metadata.Get("instance/service-accounts/default/scopes")
if err != nil {
return err
}
for _, scope := range strings.Fields(scopes) {
if scope == expectedScope {
return nil
}
}
return fmt.Errorf("Current instance does not have the expected scope (%q). Actual scopes: %v", expectedScope, scopes)
}
// Get a token for performing GCE requests.
func GetAuthToken() (AuthToken, error) {
rawToken, err := metadata.Get("instance/service-accounts/default/token")
if err != nil {
return AuthToken{}, err
}
var token AuthToken
err = json.Unmarshal([]byte(rawToken), &token)
if err != nil {
return AuthToken{}, fmt.Errorf("failed to unmarshal service account token with output %q: %v", rawToken, err)
}
return token, err
}