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compute.go
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compute.go
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// Copyright 2023 Google LLC
//
// 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 idtoken
import (
"context"
"fmt"
"net/url"
"time"
"cloud.google.com/go/auth"
"cloud.google.com/go/auth/internal"
"cloud.google.com/go/compute/metadata"
)
const identitySuffix = "instance/service-accounts/default/identity"
// computeTokenProvider checks if this code is being run on GCE. If it is, it
// will use the metadata service to build a TokenProvider that fetches ID
// tokens.
func computeTokenProvider(opts *Options) (auth.TokenProvider, error) {
if opts.CustomClaims != nil {
return nil, fmt.Errorf("idtoken: Options.CustomClaims can't be used with the metadata service, please provide a service account if you would like to use this feature")
}
tp := computeIDTokenProvider{
audience: opts.Audience,
format: opts.ComputeTokenFormat,
client: *metadata.NewClient(opts.client()),
}
return auth.NewCachedTokenProvider(tp, &auth.CachedTokenProviderOptions{
ExpireEarly: 5 * time.Minute,
}), nil
}
type computeIDTokenProvider struct {
audience string
format ComputeTokenFormat
client metadata.Client
}
func (c computeIDTokenProvider) Token(ctx context.Context) (*auth.Token, error) {
v := url.Values{}
v.Set("audience", c.audience)
if c.format != ComputeTokenFormatStandard {
v.Set("format", "full")
}
if c.format == ComputeTokenFormatFullWithLicense {
v.Set("licenses", "TRUE")
}
urlSuffix := identitySuffix + "?" + v.Encode()
res, err := c.client.Get(urlSuffix)
if err != nil {
return nil, err
}
if res == "" {
return nil, fmt.Errorf("idtoken: invalid empty response from metadata service")
}
return &auth.Token{
Value: res,
Type: internal.TokenTypeBearer,
// Compute tokens are valid for one hour:
// https://cloud.google.com/iam/docs/create-short-lived-credentials-direct#create-id
Expiry: time.Now().Add(1 * time.Hour),
}, nil
}