1package git
 2
 3import (
 4	"io"
 5
 6	"github.com/go-git/go-git/v5/plumbing"
 7)
 8
 9// signableObject is an object which can be signed.
10type signableObject interface {
11	EncodeWithoutSignature(o plumbing.EncodedObject) error
12}
13
14// Signer is an interface for signing git objects.
15// message is a reader containing the encoded object to be signed.
16// Implementors should return the encoded signature and an error if any.
17// See https://git-scm.com/docs/gitformat-signature for more information.
18type Signer interface {
19	Sign(message io.Reader) ([]byte, error)
20}
21
22func signObject(signer Signer, obj signableObject) ([]byte, error) {
23	encoded := &plumbing.MemoryObject{}
24	if err := obj.EncodeWithoutSignature(encoded); err != nil {
25		return nil, err
26	}
27	r, err := encoded.Reader()
28	if err != nil {
29		return nil, err
30	}
31
32	return signer.Sign(r)
33}