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// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package externalaccount
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"os"
)
type fileCredentialSource struct {
File string
Format Format
}
func (cs fileCredentialSource) credentialSourceType() string {
return "file"
}
func (cs fileCredentialSource) subjectToken() (string, error) {
tokenFile, err := os.Open(cs.File)
if err != nil {
return "", fmt.Errorf("oauth2/google/externalaccount: failed to open credential file %q", cs.File)
}
defer tokenFile.Close()
tokenBytes, err := io.ReadAll(io.LimitReader(tokenFile, 1<<20))
if err != nil {
return "", fmt.Errorf("oauth2/google/externalaccount: failed to read credential file: %v", err)
}
tokenBytes = bytes.TrimSpace(tokenBytes)
switch cs.Format.Type {
case "json":
jsonData := make(map[string]any)
err = json.Unmarshal(tokenBytes, &jsonData)
if err != nil {
return "", fmt.Errorf("oauth2/google/externalaccount: failed to unmarshal subject token file: %v", err)
}
val, ok := jsonData[cs.Format.SubjectTokenFieldName]
if !ok {
return "", errors.New("oauth2/google/externalaccount: provided subject_token_field_name not found in credentials")
}
token, ok := val.(string)
if !ok {
return "", errors.New("oauth2/google/externalaccount: improperly formatted subject token")
}
return token, nil
case "text":
return string(tokenBytes), nil
case "":
return string(tokenBytes), nil
default:
return "", errors.New("oauth2/google/externalaccount: invalid credential_source file format type")
}
}
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