mirror of https://github.com/prometheus/prometheus
55 lines
1.8 KiB
Go
55 lines
1.8 KiB
Go
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// Copyright 2024 The Prometheus Authors
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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 googleiam provides an http.RoundTripper that attaches an Google Cloud accessToken
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// to remote write requests.
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package googleiam
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import (
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"context"
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"fmt"
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"net/http"
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"golang.org/x/oauth2/google"
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"google.golang.org/api/option"
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apihttp "google.golang.org/api/transport/http"
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)
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type Config struct {
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CredentialsFile string `yaml:"credentials_file,omitempty"`
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}
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// NewRoundTripper creates a round tripper that adds Google Cloud Monitoring authorization to calls
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// using either a credentials file or the default credentials.
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func NewRoundTripper(cfg *Config, next http.RoundTripper) (http.RoundTripper, error) {
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if next == nil {
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next = http.DefaultTransport
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}
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const scopes = "https://www.googleapis.com/auth/monitoring.write"
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ctx := context.Background()
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opts := []option.ClientOption{
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option.WithScopes(scopes),
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}
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if cfg.CredentialsFile != "" {
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opts = append(opts, option.WithCredentialsFile(cfg.CredentialsFile))
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} else {
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creds, err := google.FindDefaultCredentials(ctx, scopes)
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if err != nil {
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return nil, fmt.Errorf("error finding default Google credentials: %w", err)
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}
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opts = append(opts, option.WithCredentials(creds))
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}
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return apihttp.NewTransport(ctx, next, opts...)
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}
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