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