restic/vendor/cloud.google.com/go/internal/testutil/context.go

68 lines
2.0 KiB
Go

// Copyright 2014 Google Inc. All Rights Reserved.
//
// 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 testutil contains helper functions for writing tests.
package testutil
import (
"io/ioutil"
"log"
"os"
"golang.org/x/net/context"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
)
const (
envProjID = "GCLOUD_TESTS_GOLANG_PROJECT_ID"
envPrivateKey = "GCLOUD_TESTS_GOLANG_KEY"
)
// ProjID returns the project ID to use in integration tests, or the empty
// string if none is configured.
func ProjID() string {
projID := os.Getenv(envProjID)
if projID == "" {
return ""
}
return projID
}
// TokenSource returns the OAuth2 token source to use in integration tests,
// or nil if none is configured. If the environment variable is unset,
// TokenSource will try to find 'Application Default Credentials'. Else,
// TokenSource will return nil.
// TokenSource will log.Fatal if the token source is specified but missing or invalid.
func TokenSource(ctx context.Context, scopes ...string) oauth2.TokenSource {
key := os.Getenv(envPrivateKey)
if key == "" { // Try for application default credentials.
ts, err := google.DefaultTokenSource(ctx, scopes...)
if err != nil {
log.Println("No 'Application Default Credentials' found.")
return nil
}
return ts
}
jsonKey, err := ioutil.ReadFile(key)
if err != nil {
log.Fatalf("Cannot read the JSON key file, err: %v", err)
}
conf, err := google.JWTConfigFromJSON(jsonKey, scopes...)
if err != nil {
log.Fatalf("google.JWTConfigFromJSON: %v", err)
}
return conf.TokenSource(ctx)
}