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//go:build unix || !windows
// +build unix !windows
package archive
import (
"bytes"
"io"
"io/ioutil"
"os"
"path/filepath"
"strings"
"github.com/pkg/errors"
"github.com/proglottis/gpgme"
)
// ------------------- GPG
// Decrypter is the gpgme interface
type Decrypter interface {
Decrypt(r io.Reader) (*gpgme.Data, error)
}
// Gpgme is for real gpgme stuff
type Gpgme struct{}
// Decrypt does the obvious
func (Gpgme) Decrypt(r io.Reader) (*gpgme.Data, error) {
return gpgme.Decrypt(r)
}
// NullGPG is for testing
type NullGPG struct{}
// Decrypt does the obvious
func (NullGPG) Decrypt(r io.Reader) (*gpgme.Data, error) {
b, _ := ioutil.ReadAll(r)
return gpgme.NewDataBytes(b)
}
// Gpg is how we use/mock decryption stuff
type Gpg struct {
fn string
unc string
gpg Decrypter
}
// NewGpgfile initializes the struct and check filename
func NewGpgfile(fn string) (*Gpg, error) {
// Strip .gpg or .asc from filename
base := filepath.Base(fn)
pc := strings.Split(base, ".")
unc := strings.Join(pc[0:len(pc)-1], ".")
return &Gpg{fn: fn, unc: unc, gpg: Gpgme{}}, nil
}
// Extract binds it to the Archiver interface
func (a Gpg) Extract(t string) ([]byte, error) {
// Carefully open the box
fh, err := os.Open(a.fn)
if err != nil {
return []byte{}, errors.Wrap(err, "extract/open")
}
defer fh.Close()
var buf bytes.Buffer
// Do the decryption thing
plain, err := a.gpg.Decrypt(fh)
if err != nil {
return []byte{}, errors.Wrap(err, "extract/decrypt")
}
defer plain.Close()
// Save "plain" text
verbose("Decrypting %s", a.fn)
_, err = io.Copy(&buf, plain)
if err != nil {
return []byte{}, errors.Wrap(err, "extract/copy")
}
return buf.Bytes(), err
}
// Close is part of the Closer interface
func (a Gpg) Close() error {
return nil
}
// Type returns the archive type obviously.
func (a *Gpg) Type() int {
return ArchiveGpg
}
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