package git

import (
	"os"

	"github.com/ProtonMail/go-crypto/openpgp"
	"github.com/ProtonMail/go-crypto/openpgp/armor"
)

func getSigner(keyFile string) (*openpgp.Entity, error) {
	file, err := os.Open(keyFile)
	if err != nil {
		return nil, err
	}
	defer file.Close()

	block, err := armor.Decode(file)
	if err != nil {
		return nil, err
	}

	entityList, err := openpgp.ReadKeyRing(block.Body)
	if err != nil {
		return nil, err
	}

	return entityList[0], nil
}