| // Copyright 2017 Google LLC |
| // |
| // 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 internal |
| |
| import ( |
| "context" |
| "fmt" |
| "io/ioutil" |
| |
| "golang.org/x/oauth2/google" |
| ) |
| |
| // Creds returns credential information obtained from DialSettings, or if none, then |
| // it returns default credential information. |
| func Creds(ctx context.Context, ds *DialSettings) (*google.DefaultCredentials, error) { |
| if ds.Credentials != nil { |
| return ds.Credentials, nil |
| } |
| if ds.CredentialsJSON != nil { |
| return google.CredentialsFromJSON(ctx, ds.CredentialsJSON, ds.Scopes...) |
| } |
| if ds.CredentialsFile != "" { |
| data, err := ioutil.ReadFile(ds.CredentialsFile) |
| if err != nil { |
| return nil, fmt.Errorf("cannot read credentials file: %v", err) |
| } |
| return google.CredentialsFromJSON(ctx, data, ds.Scopes...) |
| } |
| if ds.TokenSource != nil { |
| return &google.DefaultCredentials{TokenSource: ds.TokenSource}, nil |
| } |
| return google.FindDefaultCredentials(ctx, ds.Scopes...) |
| } |