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storage.go
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storage.go
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package token
import (
"encoding/gob"
"os"
"github.com/pkg/errors"
"golang.org/x/oauth2"
)
// Storage is interface for accessing token data.
type Storage interface {
Read() (oauth2.Token, error)
Write(oauth2.Token) error
}
type fileStorage struct {
filename string
}
// NewFileStorage returns token storage in file.
func NewFileStorage(filename string) Storage {
return &fileStorage{
filename: filename,
}
}
func (fs *fileStorage) Read() (oauth2.Token, error) {
var out oauth2.Token
f, err := os.Open(fs.filename)
if err != nil {
return out, errors.Wrapf(err, "unable to open file for reading: %s", fs.filename)
}
defer f.Close()
dec := gob.NewDecoder(f)
err = dec.Decode(&out)
if err != nil {
return out, errors.Wrap(err, "error decoding auth file")
}
return out, nil
}
// Write truncates the file and replaces it with supplied token.
func (fs *fileStorage) Write(token oauth2.Token) error {
f, err := os.Create(fs.filename)
if err != nil {
return errors.Wrapf(err, "unable to create file: %s", fs.filename)
}
defer f.Close()
enc := gob.NewEncoder(f)
return errors.Wrap(enc.Encode(token), "error encoding auth file")
}