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token.go
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token.go
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// Copyright 2017 Istio Authors
//
// 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 credential
import (
"cloud.google.com/go/compute/metadata"
)
// TokenFetcher defines the interface to fetch token.
type TokenFetcher interface {
FetchToken() (string, error)
FetchServiceAccount() (string, error)
}
// GcpTokenFetcher implements the token fetcher in GCP.
type GcpTokenFetcher struct {
// aud is the unique URI agreed upon by both the instance and the system verifying the instance's identity.
// For more info: https://cloud.google.com/compute/docs/instances/verifying-instance-identity
Aud string
}
func (fetcher *GcpTokenFetcher) getTokenURI() string {
// The GCE metadata service URI to get identity token of current (i.e., default) service account.
return "instance/service-accounts/default/identity?audience=" + fetcher.Aud
}
// FetchToken fetches the GCE VM identity jwt token from its metadata server.
// Note: this function only works in a GCE VM environment.
func (fetcher *GcpTokenFetcher) FetchToken() (string, error) {
return metadata.Get(fetcher.getTokenURI())
}
// FetchServiceAccount fetches the GCE VM identity jwt token from its metadata server.
// Note: this function only works in a GCE VM environment.
func (fetcher *GcpTokenFetcher) FetchServiceAccount() (string, error) {
return metadata.Get("instance/service-accounts/default/email")
}