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Add support for GOOGLE_CREDENTIALS environment variable for JSON key …
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Ivan Gusev
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Nov 17, 2022
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| // Copyright 2021 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 ipam | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "log" | ||
|
|
||
| "golang.org/x/oauth2" | ||
| googleoauth "golang.org/x/oauth2/google" | ||
| "google.golang.org/api/idtoken" | ||
| "google.golang.org/api/option" | ||
| ) | ||
|
|
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| // Config is used as a general provider config throughout the provider | ||
| type Config struct { | ||
| Url string | ||
| AccessToken string | ||
| Credentials string | ||
| context context.Context | ||
| } | ||
|
|
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| // staticTokenSource is used to be able to identify static token sources without reflection. | ||
| type staticTokenSource struct { | ||
| oauth2.TokenSource | ||
| } | ||
|
|
||
| const ( | ||
| userInfoScope = "https://www.googleapis.com/auth/userinfo.email" | ||
| ) | ||
|
|
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| func (c *Config) getToken() (string, error) { | ||
|
|
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| creds, err := c.GetCredentials([]string{userInfoScope}) | ||
| if err != nil { | ||
| return "", fmt.Errorf("error calling getCredentials(): %v", err) | ||
| } | ||
|
|
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| ctx := context.Background() | ||
|
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| targetAudience := c.Url // "http://ipam-autopilot.com" | ||
|
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| co := []option.ClientOption{} | ||
| co = append(co, idtoken.WithCredentialsJSON(creds.JSON)) | ||
|
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| idTokenSource, err := idtoken.NewTokenSource(ctx, targetAudience, co...) | ||
|
|
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| if err != nil { | ||
| return "", fmt.Errorf("unable to retrieve TokenSource: %v", err) | ||
| } | ||
| idToken, err := idTokenSource.Token() | ||
| if err != nil { | ||
| return "", fmt.Errorf("unable to retrieve Token: %v", err) | ||
| } | ||
|
|
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| return idToken.AccessToken, nil | ||
| } | ||
|
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| // Get a set of credentials with a given scope (clientScopes) based on the Config object. | ||
| func (c *Config) GetCredentials(clientScopes []string) (googleoauth.Credentials, error) { | ||
| if c.AccessToken != "" { | ||
| contents, _, err := pathOrContents(c.AccessToken) | ||
| if err != nil { | ||
| return googleoauth.Credentials{}, fmt.Errorf("Error loading access token: %s", err) | ||
| } | ||
|
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| token := &oauth2.Token{AccessToken: contents} | ||
|
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| log.Printf("[INFO] Authenticating using configured Google JSON 'access_token'...") | ||
| log.Printf("[INFO] -- Scopes: %s", clientScopes) | ||
| return googleoauth.Credentials{ | ||
| TokenSource: staticTokenSource{oauth2.StaticTokenSource(token)}, | ||
| }, nil | ||
| } | ||
|
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| if c.Credentials != "" { | ||
| contents, _, err := pathOrContents(c.Credentials) | ||
| if err != nil { | ||
| return googleoauth.Credentials{}, fmt.Errorf("error loading credentials: %s", err) | ||
| } | ||
|
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| creds, err := googleoauth.CredentialsFromJSON(c.context, []byte(contents), clientScopes...) | ||
| if err != nil { | ||
| return googleoauth.Credentials{}, fmt.Errorf("unable to parse credentials from '%s': %s", contents, err) | ||
| } | ||
|
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| log.Printf("[INFO] Authenticating using configured Google JSON 'credentials'...") | ||
| log.Printf("[INFO] -- Scopes: %s", clientScopes) | ||
| return *creds, nil | ||
| } | ||
|
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| log.Printf("[INFO] Authenticating using DefaultClient...") | ||
| log.Printf("[INFO] -- Scopes: %s", clientScopes) | ||
| defaultTS, err := googleoauth.DefaultTokenSource(context.Background(), clientScopes...) | ||
| if err != nil { | ||
| return googleoauth.Credentials{}, fmt.Errorf("Attempted to load application default credentials since neither `credentials` nor `access_token` was set in the provider block. No credentials loaded. To use your gcloud credentials, run 'gcloud auth application-default login'. Original error: %w", err) | ||
| } | ||
|
|
||
| return googleoauth.Credentials{ | ||
| TokenSource: defaultTS, | ||
| }, err | ||
| } |
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