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path: root/ask/ask.go
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// Package ask implements interactive password retrieval
package ask

import (
	"errors"
	"io"
	"os"

	"golang.org/x/crypto/ssh/terminal"
)

var (
	ErrNoPassword = errors.New("please provide a password")
	ErrNoMatch    = errors.New("passwords don't match")
)

// Confirmed asks for password twice
func Confirmed() (string, error) {
	restore, err := makeRaw(os.Stdin)
	if err != nil {
		return "", err
	}
	defer restore()
	pass, err := ask(os.Stdin, "passphrase: ")
	if err != nil {
		return "", err
	}
	pass2, err := ask(os.Stdin, "confirm passphrase: ")
	if err != nil {
		return "", err
	}
	if pass != pass2 {
		return "", ErrNoMatch
	}
	return pass, nil
}

// Password asks for password once
func Password() (string, error) {
	restore, err := makeRaw(os.Stdin)
	if err != nil {
		return "", err
	}
	defer restore()
	return ask(os.Stdin, "passphrase: ")
}

func ask(rw io.ReadWriter, prompt string) (string, error) {
	pass, err := terminal.NewTerminal(rw, "").ReadPassword(prompt)
	if err != nil {
		return "", err
	}
	if len(pass) == 0 {
		return "", ErrNoPassword
	}
	return pass, nil
}

func makeRaw(f *os.File) (func(), error) {
	fd := int(f.Fd())
	oldState, err := terminal.MakeRaw(fd)
	if err != nil {
		return nil, err
	}
	return func() { terminal.Restore(fd, oldState) }, nil
}