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url_provider.go
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url_provider.go
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// Copyright 2023 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 externalaccount
import (
"context"
"encoding/json"
"errors"
"fmt"
"net/http"
"cloud.google.com/go/auth/internal"
"cloud.google.com/go/auth/internal/credsfile"
)
const (
fileTypeText = "text"
fileTypeJSON = "json"
urlProviderType = "url"
programmaticProviderType = "programmatic"
)
type urlSubjectProvider struct {
URL string
Headers map[string]string
Format *credsfile.Format
Client *http.Client
}
func (sp *urlSubjectProvider) subjectToken(ctx context.Context) (string, error) {
req, err := http.NewRequestWithContext(ctx, "GET", sp.URL, nil)
if err != nil {
return "", fmt.Errorf("credentials: HTTP request for URL-sourced credential failed: %w", err)
}
for key, val := range sp.Headers {
req.Header.Add(key, val)
}
resp, err := sp.Client.Do(req)
if err != nil {
return "", fmt.Errorf("credentials: invalid response when retrieving subject token: %w", err)
}
defer resp.Body.Close()
respBody, err := internal.ReadAll(resp.Body)
if err != nil {
return "", fmt.Errorf("credentials: invalid body in subject token URL query: %w", err)
}
if c := resp.StatusCode; c < http.StatusOK || c >= http.StatusMultipleChoices {
return "", fmt.Errorf("credentials: status code %d: %s", c, respBody)
}
if sp.Format == nil {
return string(respBody), nil
}
switch sp.Format.Type {
case "json":
jsonData := make(map[string]interface{})
err = json.Unmarshal(respBody, &jsonData)
if err != nil {
return "", fmt.Errorf("credentials: failed to unmarshal subject token file: %w", err)
}
val, ok := jsonData[sp.Format.SubjectTokenFieldName]
if !ok {
return "", errors.New("credentials: provided subject_token_field_name not found in credentials")
}
token, ok := val.(string)
if !ok {
return "", errors.New("credentials: improperly formatted subject token")
}
return token, nil
case fileTypeText:
return string(respBody), nil
default:
return "", errors.New("credentials: invalid credential_source file format type: " + sp.Format.Type)
}
}
func (sp *urlSubjectProvider) providerType() string {
return urlProviderType
}