mirror of
https://github.com/rocky-linux/peridot.git
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87 lines
2.6 KiB
Go
87 lines
2.6 KiB
Go
// Copyright 2023 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package credentials
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import (
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"net/url"
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"strings"
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"time"
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"cloud.google.com/go/auth"
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"cloud.google.com/go/compute/metadata"
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)
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var (
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computeTokenMetadata = map[string]interface{}{
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"auth.google.tokenSource": "compute-metadata",
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"auth.google.serviceAccount": "default",
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}
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computeTokenURI = "instance/service-accounts/default/token"
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)
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// computeTokenProvider creates a [cloud.google.com/go/auth.TokenProvider] that
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// uses the metadata service to retrieve tokens.
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func computeTokenProvider(opts *DetectOptions) auth.TokenProvider {
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return auth.NewCachedTokenProvider(computeProvider{scopes: opts.Scopes}, &auth.CachedTokenProviderOptions{
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ExpireEarly: opts.EarlyTokenRefresh,
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DisableAsyncRefresh: opts.DisableAsyncRefresh,
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})
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}
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// computeProvider fetches tokens from the google cloud metadata service.
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type computeProvider struct {
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scopes []string
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}
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type metadataTokenResp struct {
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AccessToken string `json:"access_token"`
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ExpiresInSec int `json:"expires_in"`
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TokenType string `json:"token_type"`
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}
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func (cs computeProvider) Token(ctx context.Context) (*auth.Token, error) {
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tokenURI, err := url.Parse(computeTokenURI)
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if err != nil {
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return nil, err
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}
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if len(cs.scopes) > 0 {
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v := url.Values{}
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v.Set("scopes", strings.Join(cs.scopes, ","))
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tokenURI.RawQuery = v.Encode()
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}
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tokenJSON, err := metadata.GetWithContext(ctx, tokenURI.String())
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if err != nil {
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return nil, fmt.Errorf("credentials: cannot fetch token: %w", err)
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}
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var res metadataTokenResp
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if err := json.NewDecoder(strings.NewReader(tokenJSON)).Decode(&res); err != nil {
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return nil, fmt.Errorf("credentials: invalid token JSON from metadata: %w", err)
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}
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if res.ExpiresInSec == 0 || res.AccessToken == "" {
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return nil, errors.New("credentials: incomplete token received from metadata")
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}
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return &auth.Token{
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Value: res.AccessToken,
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Type: res.TokenType,
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Expiry: time.Now().Add(time.Duration(res.ExpiresInSec) * time.Second),
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Metadata: computeTokenMetadata,
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}, nil
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}
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