/
gcp.go
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/
gcp.go
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// Copyright 2018 The Go Cloud Development Kit 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
//
// https://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 gcp provides fundamental Wire providers and types for Google Cloud Platform (GCP).
package gcp // import "gocloud.dev/gcp"
import (
"context"
"errors"
"net/http"
"github.com/google/wire"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
)
// DefaultIdentity is a Wire provider set that provides the project ID
// and token source from Application Default Credentials (ADC).
var DefaultIdentity = wire.NewSet(
CredentialsTokenSource,
DefaultCredentials,
DefaultProjectID)
// ProjectID is a GCP Project ID.
type ProjectID string
// TokenSource wraps a GCP token source that provides Cloud-Platform-
// scoped tokens.
type TokenSource oauth2.TokenSource
// HTTPClient is an HTTP client that makes requests authenticated with Cloud-
// Platform-scoped authentication tokens.
type HTTPClient struct {
http.Client
}
// NewHTTPClient creates a new authenticated HTTP client.
func NewHTTPClient(transport http.RoundTripper, ts TokenSource) (*HTTPClient, error) {
if ts == nil {
return nil, errors.New("gcp: no credentials available")
}
return &HTTPClient{
Client: http.Client{
Transport: &oauth2.Transport{
Base: transport,
Source: ts,
},
},
}, nil
}
// DefaultTransport returns http.DefaultTransport.
func DefaultTransport() http.RoundTripper {
return http.DefaultTransport
}
// DefaultCredentials obtains the default GCP credentials with Cloud Platform
// scope.
func DefaultCredentials(ctx context.Context) (*google.Credentials, error) {
adc, err := google.FindDefaultCredentials(ctx, "https://www.googleapis.com/auth/cloud-platform")
if err != nil {
return nil, err
}
return adc, nil
}
// CredentialsTokenSource extracts the token source from GCP credentials.
func CredentialsTokenSource(creds *google.Credentials) TokenSource {
if creds == nil {
return nil
}
return TokenSource(creds.TokenSource)
}
// DefaultProjectID obtains the project ID from the default GCP credentials.
func DefaultProjectID(creds *google.Credentials) (ProjectID, error) {
if creds == nil {
return "", errors.New("gcp: no project found in credentials")
}
return ProjectID(creds.ProjectID), nil
}